Ruth 1:3-5 NIV

3 Now Elimelek, Naomi’s husband, died, and she was left with her two sons.
4 They married Moabite women, one named Orpah and the other Ruth. After they had lived there about ten years,

References for Ruth 1:4

5 both Mahlon and Kilion also died, and Naomi was left without her two sons and her husband.

References for Ruth 1:5