Rachel and Leah Amiable and fruitful. These two are singled out, because they were of a foreign original, and yet ingrafted into God's people, as Ruth was; and because of that fertility which God vouchsafed unto them above their predecessors, Sarah and Rebecca. Rachel is placed before Leah, because she was his most lawful and best beloved wife. Which two did build the house of Israel Were blessed with a numerous posterity. They do not mention the two handmaids, because the former were Jacob's principal wives, whose servants bare children not for themselves, but their mistresses.
Related Commentaries of Ruth 4:11
Ruth 4:11
11 And all the people that were in the gate, and the elders, said, We are witnesses. The LORD make the woman that is come into thine house like Rachel and like Leah, which two did build the house of Israel: and do thou worthily in Ephratah, and be famous in Bethlehem: