See marginal references and notes. The Levirate law probably existed among the Moabites, and in Israel extended beyond the brother in the strict sense, and applied to the nearest relations, since Boaz was only the kinsman of Elimelech Ruth 3:12.
Related Commentaries of Ruth 1:11
Ruth 1:11-13
11 And Naomi said, Turn again, my daughters: why will ye go with me? are there yet any more sons in my womb, that they may be your husbands?
12 Turn again, my daughters, go your way; for I am too old to have an husband. If I should say, I have hope, if I should have an husband also to night, and should also bear sons;
13 Would ye tarryb for them till they were grown? would ye stay for them from having husbands? nay, my daughters; for it grieveth me much for your sakes that the hand of the LORD is gone out against me.