Easton's Dictionary
Sickly, the elder of Elimelech the Bethlehemite’s two sons by
Naomi. He married Ruth and died childless (Ruth 1:2, 5; 4:9,
10), in the land of Moab.
International Standard Bible Encyclopedia
ma'-lon (machlon, "invalid"): Ruth's first husband (Ru 12,5; 4:9,10). In the latter passage is further evidence of the unwillingness to allow a family connection or inheritance to drop (see MAHLAH; MAHLI). Note that David's descent and that of his "Greater Son" come through Ru and Boaz (Ru 4:22).