(KJV) Genesis 15:12
12 And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him. 13 And he said unto Abram, Know of a surety that thy seed shall be a stranger in a land that is not theirs, and shall serve them; and they shall afflict them four hundred years; 14 And also that nation, whom they shall serve, will I judge: and afterward shall they come out with great substance. 15 And thou shalt go to thy fathers in peace; thou shalt be buried in a good old age. 16 But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full
In the above text God promises Abraham that his descendants will come back from captivity in the fourth generation.
If we start counting from Abraham who is given the promise Judah & his brothers are the fourth generation.
Judah & his brothers are not the ones that came out,but are the ones that actually went into Egypt.
So from whom is the fourth generation reckoned here?.