'Themselves' in the Bible

Who improvise to the sound of the harp,And like David have composed songs for themselves,

Who drink wine from sacrificial bowlsWhile they anoint themselves with the finest of oils,Yet they have not grieved over the ruin of Joseph.

“Though they hide on the summit of Carmel,I will search them out and take them from there;And though they conceal themselves from My sight on the floor of the sea,From there I will command the serpent and it will bite them.