Genesis 29:28

“And Jacob did so, and fulfilled her week, etc.] The week of the days of the feast of Leah, as the Targum of Jonathan adds; he agreed to it; during which time he cohabited with Leah as his wife, and which confirmed the marriage: how justifiable this was, must be left. The marrying of two sisters was forbidden by the law of Moses, (<031818>Leviticus 18:18); and polygamy was not allowed of in later times, and yet both were dispensed with in times preceding; and there seems to be an overruling Providence in this affair, which oftentimes brings good out of evil, since the Messiah was to spring from Leah, and not Rachel; (see Gill on “<012935>Genesis 29:35”); and having more wives than one, and…”

“gave him Rachel also--It is evident that the marriage of both sisters took place nearly about the same time, and that such a connection was then allowed, though afterwards prohibited (Lev 18:18).”

“29:28-30 After the bridal week ended (29:27), Jacob also received Rachel as his wife, though he then would have to work an additional seven years (cp. 31:41). Laban seemed to have gained the upper hand.”