The Hebrew literally says, those who went out from Jacob’s loins.
This means that seventy persons
refers to Jacob’s direct descendants—his sons and daughters, grandsons and great-grandsons—as recounted in Genesis 46:8–27. However, the whole group that entered Egypt was larger than seventy people. It also included Jacob’s other daughters, his sons’ wives and daughters (Genesis 46:7), and possibly servants.1
(Interestingly, the Hebrew word for loins
is used for a man’s offspring in only one other case in Scripture: Judges 8:30 tells us that Gideon also had seventy descendants who went out from his loins.)
5 All the descendants of Jacob were seventy persons; Joseph was already in Egypt.