Exodus Chapter 10 is A Precursor Of Numbers 30:3 That Says, When You Make A Vow To Hashem Be Sure To Fulfill It

Pharaoh Did Not Fulfill But Mocks G-d Repeatedly Once Alleviated

*More Often You Do Make A Vow To Be A Good Person Or Surrendering All To Hashem. But These Utterances Only Happen When You Are In Difficulty Or In Need. Shortly After When Things Come Back To Normal — Your Vow Is Quickly Forgotten.

“Locust” — The Eighth Plaque
“Darkness” — The Ninth Plaque
“Pharaoh’s Offerings and Last stubbornness”

Hashem said to Moses, “Come to Pharaoh, for I have made his heart and the heart of his servants stubborn so that I can put these signs of Mine in his midst; … – that you may know that I am Hashem.”
10:1
Moses and Aaron came to Pharaoh and said to him, “So said Hashem, God of the Hebrews: Until when will you refuse to be humbled before Me?
10:3
For if you refuse to send forth My people, behold, tomorrow I shall bring a locust-swarm into your border.
:4
Pharaoh’s servants said to him, “How long will this be a snare for us? Send out the men that they may serve Hashem, their God! Do you not yet know that Egypt is lost?”
:7
Moses said, “With our youngsters and with our elders shall we go; with our sons and with our daughters, with our flock and with our cattle shall we go, because it is a festival of Hashem for us.”
:9
The locust-swarm ascended over the entire land of Egypt and it rested in the entire border of Egypt, very severely; before it there was never a locust-swarm like it and after it there will not be its equal.
:14
But Hashem strengthened the heart of Pharaoh, and he did not send out the Children of Israel.
:20
Hashem said to Moses, “Stretch forth your hand toward the heavens, and there shall be darkness upon the land of Egypt, and the darkness will be tangible.”
:21
Moses stretched forth his hand toward the heavens and there was a thick darkness throughout the land of Egypt for a three-day period.
:22
No man could see his brother nor could anyone rise from his place for a three-day period; but for all the Children of Israel there was light in their dwellings.
:23
Pharaoh said to him, “Go from me! Beware – do not see my face any more, for on the day you see my face you shall die!”
:28
Moses said, “You have spoken correctly. I shall never see your face again.”
:29

1 The Lord said to Moses: “Come to Pharaoh, for I have hardened his heart and the heart of his servants, in order that I may place these signs of Mine in his midst,
2 and in order that you tell into the ears of your son and your son’s son how I made a mockery of the Egyptians, and [that you tell of] My signs that I placed in them, and you will know that I am the Lord.”
3 So Moses and Aaron came to Pharaoh and said to him, “So said the Lord, the God of the Hebrews, How long will you refuse to humble yourself before Me? Let My people go, and they will worship Me.
4 For if you refuse to let [them] go, behold, tomorrow I am going to bring locusts into your borders.
5 And they will obscure the view of the earth, and no one will be able to see the earth, and they will eat the surviving remnant, which remains for you from the hail, and they will eat all your trees that grow out of the field.
6 And your houses and the houses of all your servants and the houses of all the Egyptians will be filled, which your fathers and your fathers’ fathers did not see since the day they were on the earth until this day.’ ” [Therewith,] he turned and left Pharaoh.
7 Pharaoh’s servants said to him, “How long will this one be a stumbling block to us? Let the people go and they will worship their God. Don’t you yet know that Egypt is lost?”
8 [Thereupon,] Moses and Aaron were brought back to Pharaoh, and he said to them, “Go, worship the Lord your God. Who and who are going?”
9 Moses said, “With our youth and with our elders we will go, with our sons and with our daughters, with our flocks and with our cattle we will go, for it is a festival of the Lord to us.”
10 So he [Pharaoh] said to them, “So may the Lord be with you, just as I will let you and your young children out. See that evil is before your faces.
11 Not so; let the men go now and worship the Lord, for that is what you request.” And he chased them out from before Pharaoh.
12 The Lord said to Moses, “Stretch forth your hand over the land of Egypt for the locusts, and they will ascend over the land of Egypt, and they will eat all the vegetation of the earth, all that the hail has left over.”
13 So Moses stretched forth his staff over the land of Egypt, and the Lord led an east wind in the land all that day and all the night. [By the time] it was morning, the east wind had borne the locusts.
14 The locusts ascended over the entire land of Egypt, and they alighted within all the border[s] of Egypt, very severe; before them, there was never such a locust [plague], and after it, there will never be one like it.
15 They obscured the view of all the earth, and the earth became darkened, and they ate all the vegetation of the earth and all the fruits of the trees, which the hail had left over, and no greenery was left in the trees or in the vegetation of the field[s] throughout the entire land of Egypt.
16 Pharaoh hastened to summon Moses and Aaron, and he said, “I have sinned against the Lord your God and against you.
17 But now, forgive now my sin only this time and entreat the Lord your God, and let Him remove from me just this death.”
18 So he [Moses] left Pharaoh and entreated the Lord,
19 and the Lord reversed a very strong west wind, and it picked up the locusts and thrust them into the Red Sea. Not one locust remained within all the border[s] of Egypt.
20 But the Lord strengthened Pharaoh’s heart, and he did not let the children of Israel go out.
21 The Lord said to Moses, “Stretch forth your hand toward the heavens, and there will be darkness over the land of Egypt, and the darkness will become darker.”
22 So Moses stretched forth his hand toward the heavens, and there was thick darkness over the entire land of Egypt for three days.
23 They did not see each other, and no one rose from his place for three days, but for all the children of Israel there was light in their dwellings.
24 Pharaoh summoned Moses and said, “Go! Worship the Lord, but your flocks and your cattle shall be left. Your young children may also go with you.”
25 But Moses said, “You too shall give sacrifices and burnt offerings into our hands, and we will make them for the Lord our God.
26 And also our cattle will go with us; not a [single] hoof will remain, for we will take from it to worship the Lord our God, and we do not know how [much] we will worship the Lord until we arrive there.”
27 The Lord strengthened Pharaoh’s heart, and he was unwilling to let them out.
28 Pharaoh said to him, “Go away from me! Beware! You shall no longer see my face, for on the day that you see my face, you shall die!”
29 [Thereupon,] Moses said, “You have spoken correctly; I shall no longer see your face.”