Exodus 3:19

And I -- I have known that the king of Egypt doth not permit you to go, unless by a strong hand,

Exodus 5:2

and Pharaoh saith, 'Who is Jehovah, that I hearken to His voice, to send Israel away? I have not known Jehovah, and Israel also I do not send away.'

Exodus 6:1

And Jehovah saith unto Moses, 'Now dost thou see that which I do to Pharaoh, for with a strong hand he doth send them away, yea, with a strong hand he doth cast them out of his land.'

Exodus 7:1-14

And Jehovah saith unto Moses, 'See, I have given thee a god to Pharaoh, and Aaron thy brother is thy prophet;

Psalm 136:11-12

And bringing forth Israel from their midst, For to the age is His kindness.

Isaiah 63:12-13

Leading by the right hand of Moses, the arm of His glory, Cleaving waters from before them, To make to Himself a name age-during.

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
and Pharaoh saith, 'Who is Jehovah, that I hearken to His voice, to send Israel away? I have not known Jehovah, and Israel also I do not send away.'
Exodus 7:4
and Pharaoh doth not hearken, and I have put My hand on Egypt, and have brought out My hosts, My people, the sons of Israel, from the land of Egypt by great judgments;

No, not by a mighty hand

Exodus 6:1
And Jehovah saith unto Moses, 'Now dost thou see that which I do to Pharaoh, for with a strong hand he doth send them away, yea, with a strong hand he doth cast them out of his land.'
Psalm 136:11
And bringing forth Israel from their midst, For to the age is His kindness.
Isaiah 63:12
Leading by the right hand of Moses, the arm of His glory, Cleaving waters from before them, To make to Himself a name age-during.