Verses with the word mahlon in the Old Testament (3 verses):

Ruth 1:2
And the name of the man was Elimelech, and the name of his wife Naomi, and the name of his two sons Mahlon and Chilion, Ephrathites of Bethlehemjudah. And they came into the country of Moab, and continued there.

Ruth 1:5
And Mahlon and Chilion died also both of them; and the woman was left of her two sons and her husband.

Ruth 4:10
Moreover Ruth the Moabitess, the wife of Mahlon, have I purchased to be my wife, to raise up the name of the dead upon his inheritance, that the name of the dead be not cut off from among his brethren, and from the gate of his place: ye are witnesses this day.