John Gill Commentary Exodus 1:3

"Issachar, Zebulun, and Benjamin," — Exodus 1:3 (ASV)

Issachar, Zebulun
The other two sons of Jacob, by Leah:

Benjamin ;
the youngest of all Jacob's sons is placed here, being his son by his beloved wife Rachel. Joseph is not put into the account, because he did not go into Egypt with Jacob.