Albert Barnes on Acts 7:9

Moved with envy. That is, dissatisfied with the favour which their father Jacob showed Joseph, and envious at the dreams which indicated that he was to be raised to remarkable honour above his parents and brethren, Gen 37:3-11.

Sold Joseph into Egypt. Sold him, that he might be taken to Egypt. This was done at the suggestion of Judah, who advised it that Joseph might not be put to death by his brethren, Gen 27:28. It is possible that Stephen, by this fact, might have designed to prepare the way for a severe rebuke of the Jews for having dealt in a similar manner with their Messiah.

But God was with him. God protected him, and overruled all these wicked doings, so that he was raised to extraordinary honours.

(f) "envy" Gen 37:28, Ps 105:17 (g) "God was with him" Gen 39:2,21