John Gills Exposition of the Bible Commentary - Ruth 4:10
Moreover, Ruth the Moabitess, the wife of Mahlon, have I purchased to be my wife ,.... Which was the condition on which the purchase of the land was, that whoever bought that should take her for his wife; nor did Boaz do evil in marrying her, though a Moabitess. Moab was not one of the nations with whom marriage was forbidden; and though it was a Heathenish and idolatrous nation, and so on that account it was not fit and proper to marry with such, yet Ruth was become a proselytess; nor was... read more
Matthew Henry's Complete Commentary - Ruth 4:9-12
Boaz now sees his way clear, and therefore delays not to perform his promise made to Ruth that he would do the kinsman's part, but in the gate of the city, before the elders and all the people, publishes a marriage-contract between himself and Ruth the Moabitess, and therewith the purchase of all the estate that belonged to the family of Elimelech. If he had not been (Ruth 2:1) a mighty man of wealth, he could not have compassed this redemption, nor done this service to his kinsman's family.... read more