Exodus 3:19

But, I, know, that the king of Egypt will not suffer you to go, - not even by a firm hand.

Exodus 5:2

Then said Pharaoh, Who is Yahweh that I should hearken to his voice, to let Israel go? I know not Yahweh, and certainly. Israel, will I not let go!

Exodus 6:1

Then said Yahweh unto Moses, Now, shalt thou see, what I will do to Pharaoh, for with a strong hand, shall he let them go, and with a strong hand, shall he drive them out from his land.

Exodus 7:1-14

Then said Yahweh unto Moses - See! I have appointed thee to be God unto Pharaoh, - and, Aaron thy brother, shall be thy prophet!

Psalm 136:11-12

And brought forth Israel out of their midst, For, age-abiding, is his lovingkindness.

Isaiah 63:12-13

That caused to go at the right hand of Moses his own majestic arm, - Cleaving the waters from before them, To make himself an age-abiding name:

Treasury of Scripture Knowledge

Summary

And I am sure that the king of Egypt will not let you go, no, not by a mighty hand.

No, not by a mighty hand

Bible References

Will not

Exodus 5:2
Then said Pharaoh, Who is Yahweh that I should hearken to his voice, to let Israel go? I know not Yahweh, and certainly. Israel, will I not let go!
Exodus 7:4
And Pharaoh will not hearken unto you, so will I lay my hand on Egypt, - and bring forth my hosts - my people the sons of Israel out of the land of Egypt, with great judgments.

No, not by a mighty hand

Exodus 6:1
Then said Yahweh unto Moses, Now, shalt thou see, what I will do to Pharaoh, for with a strong hand, shall he let them go, and with a strong hand, shall he drive them out from his land.
Psalm 136:11
And brought forth Israel out of their midst, For, age-abiding, is his lovingkindness.
Isaiah 63:12
That caused to go at the right hand of Moses his own majestic arm, - Cleaving the waters from before them, To make himself an age-abiding name: