3:19. But I know that the king of Egypt will not let you go, but by a mighty hand.
3:20. For I will stretch forth my hand, and will strike Egypt with all my wonders which I will do in the midst of them: after these he will let you go.
3:21. And I will give favour to this people, in the sight of the Egyptians: and when you go forth, you shall not depart empty:
3:22. But every woman shall ask of her neighbour, and of her that is in her house, vessels of silver and of gold, and raiment: and you shall put them on your sons and daughters, and shall spoil Egypt.
Shall spoil, etc. . .That is, you shall strip, and take away the goods of the Egyptians. This was not authorizing theft or injustice; but was a just disposal made by Him, who is the great lord and master of all things, in order to pay the children of Israel some part of what was due to them from the Egyptians for their labours.
Exodus Chapter 4
Moses is empowered to confirm his mission with miracles: his brother
Aaron is appointed to assist him.
4:1. Moses answered, and said: They will not believe me, nor hear my voice, but they will say: The Lord hath not appeared to thee.
4:2. Then he said to him: What is that thou holdest in thy hand? He answered: A rod.
4:3. And the Lord said: Cast it down upon the ground. He cast it down, and it was turned into a serpent, so that Moses fled from it.