Like Rachel and like Leah, amiable and fruitful. Those two are singled out, partly because they were of a foreign and heathenish original, and yet ingrafted into God's people, as Ruth also was; and partly because of that singular fertility which God vouchsafed unto them above their predecessors, Sarah and Rebekah. Rachel is placed before Leah, because she was his most lawful, and only intended, and chosen, and best beloved wife. Build the house, i.e. increase the posterity. See Genesis 16:2 Exodus 1:21. Ephratah and Bethlehem, two names of one and the same place; of which See Poole on "Ruth 1:2".
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: