But now after you have known G-d, or rather are known by G-d, how is it that you turn again to the weak and beggarly elements, to which you desire again to be in bondage?
You observe days and months and seasons and years.
Gal. 4:9-10

The Lord spoke to: Moses, saying:
Command the children of Israel and say to them: My offering, My food for My fire offerings, a spirit of satisfaction for Me, you shall take care to offer to Me at its appointed time.
Numbers 28:1-2

The one lamb you shall offer up in the morning, and the other lamb you shall offer up in the afternoon.
Numbers 28:4

And on the Sabbath day, two unblemished lambs in the first year, and two tenths fine flour as a meal offering, mixed with oil, and its libation.
Numbers 28:9

And on the beginning of your months, you shall offer up a burnt offering to the Lord: two young bulls, one ram, and seven lambs in the first year, [all] unblemished.
Numbers 28:11

In the first month, on the fourteenth day of the month, [you shall offer up] a Passover offering to the Lord.
On the fifteenth day of this month, a festival [begins]; you shall eat unleavened bread for seven days.
On the first day is a holy convocation; you shall not perform any mundane work.
You shall offer up a fire offering, a burnt offering to the Lord: two young bulls, one ram, and seven lambs in the first year they shall be unblemished for you.
Numbers 28:16-19

The seventh day shall be a holy convocation for you; you shall not perform any mundane work.
On the day of the first fruits, when you offer up a new meal offering to the Lord, on your festival of Weeks; it shall be a holy convocation for you, and you shall not perform any mundane work.
Numbers 28:25-26

For as many as are of the works of the law are under the curse; for it is written, “Cursed is everyone who does not continue in all things which are written in the book of the law, to do them.”
But that no one is justified by the law in the sight of G-d is evident, for “the just shall live by faith.”
Yet the law is not of faith, but “the man who does them shall live by them.”
Gal. 3:10-12

in the day when G-d will judge the secrets of men by Jesus Christ, according to my gospel.
Rom. 2:16

And Abram was ninety-nine years old, and God appeared to Abram, and He said to him, “I am the Almighty God; walk before Me and be perfect.
Genesis 17:1

And I will multiply your seed like the stars of the heavens, and I will give your seed all these lands, and all the nations of the earth will bless themselves by your seed,
Because Abraham hearkened to My voice, and kept My charge, My commandments, My statutes, and My instructions.”
Genesis 26:4-5

And now, if you obey Me and keep My covenant, you shall be to Me a treasure out of all peoples, for Mine is the entire earth.
And you shall be to Me a kingdom of princes and a holy nation.’ These are the words that you shall speak to the children of Israel.”
Exodus 19:5-6

and if you despise My statutes and reject My ordinances, not performing any of My commandments, thereby breaking My covenant
then I too, will do the same to you; I will order upon you shock, consumption, fever, and diseases that cause hopeless longing and depression. You will sow your seed in vain, and your enemies will eat it.
Leviticus 26:15-16

‘None of the men from the age of twenty years and over who came out of Egypt will see the land that I swore to Abraham, to Isaac, and to Jacob, for they did not follow Me wholeheartedly,
except for Caleb the son of Jephunneh the Kenizite and Joshua the son of Nun, for they followed the Lord wholeheartedly.’
Numbers 32:11-12

Everything I command you that you shall be careful to do it. You shall neither add to it, nor subtract from it.
If there will arise among you a prophet, or a dreamer of a dream, and he gives you a sign or a wonder,
and the sign or the wonder of which he spoke to you happens, [and he] says, “Let us go after other gods which you have not known, and let us worship them,”
you shall not heed the words of that prophet, or that dreamer of a dream; for the Lord, your God, is testing you, to know whether you really love the Lord, your God, with all your heart and with all your soul.
You shall follow the Lord, your God, fear Him, keep His commandments, heed His voice, worship Him, and cleave to Him.
Deuteronomy 13:1-5

If your brother, the son of your mother, tempts you in secret or your son, or your daughter, or the wife of your embrace, or your friend, who is as your own soul saying, “Let us go and worship other gods, which neither you, nor your forefathers have known.”
Of the gods of the peoples around you, [whether] near to you or far from you, from one end of the earth to the other end of the earth;
You shall not desire him, and you shall not hearken to him; neither shall you pity him, have mercy upon him, nor shield him.
Deuteronomy 13:7-9

1 Everything I command you that you shall be careful to do it. You shall neither add to it, nor subtract from it.
2 If there will arise among you a prophet, or a dreamer of a dream, and he gives you a sign or a wonder,
3 and the sign or the wonder of which he spoke to you happens, [and he] says, “Let us go after other gods which you have not known, and let us worship them,”
4 you shall not heed the words of that prophet, or that dreamer of a dream; for the Lord, your God, is testing you, to know whether you really love the Lord, your God, with all your heart and with all your soul.
5 You shall follow the Lord, your God, fear Him, keep His commandments, heed His voice, worship Him, and cleave to Him.
6 And that prophet, or that dreamer of a dream shall be put to death; because he spoke falsehood about the Lord, your God Who brought you out of the land of Egypt, and Who redeemed you from the house of bondage, to lead you astray from the way in which the Lord, your God, commanded you to go; so shall you clear away the evil from your midst.
7 If your brother, the son of your mother, tempts you in secret or your son, or your daughter, or the wife of your embrace, or your friend, who is as your own soul saying, “Let us go and worship other gods, which neither you, nor your forefathers have known.”
8 Of the gods of the peoples around you, [whether] near to you or far from you, from one end of the earth to the other end of the earth;
9 You shall not desire him, and you shall not hearken to him; neither shall you pity him, have mercy upon him, nor shield him.
10 But you shall surely kill him, your hand shall be the first against him to put him to death, and afterwards the hand of all the people.
11 And you shall stone him with stones so that he dies, because he sought to lead you astray from the Lord, your God, Who brought you out of the land of Egypt, out of the house of bondage.
12 And all Israel shall listen and fear, and they shall no longer do any evil such as this in your midst.
13 If you hear in one of your cities which the Lord, your God, is giving you to dwell therein, saying,
14 “Unfaithful men have gone forth from among you and have led the inhabitants of their city astray, saying, ‘Let us go and worship other gods, which you have not known.’ “
15 Then you shall inquire, investigate, and ask thoroughly, and, behold, it is true, the matter is certain, that such abomination has been committed in your midst:
16 You shall surely strike down the inhabitants of that city with the edge of the sword, destroy it with all that is in it and its livestock, with the edge of the sword.
17 And you shall collect all its spoil into the midst of its open square, and burn with fire the city and all its spoil, completely, for the Lord, your God; and it shall be a heap of destruction forever, never to be rebuilt.
18 And nothing that is doomed to destruction shall cling to your hand, so that the Lord may return from His fierce wrath, and grant you compassion, and be compassionate with you, and multiply you, as He swore to your forefathers.
19 For you shall hearken to the voice of the Lord your God, to keep all His commandments which I command you this day, to do that which is proper in the eyes of the Lord, your God.