'Themselves' in the Bible

Those who are full hire themselves out for food,but those who are starving hunger no more.The woman who is childless gives birth to seven,but the woman with many sons pines away.

They let themselves be seen by the Philistine garrison, and the Philistines said, “Look, the Hebrews are coming out of the holes where they’ve been hiding!”

The priest told him, “There is no ordinary bread on hand. However, there is consecrated bread, but the young men may eat it only if they have kept themselves from women.”