'Supposed' in the Bible

he would stick it into the boiler or pot, and take everything the fork brought up that is, the priest would take it for himself. This is what they were supposed to do with all the Israelis who came there to Shiloh.

So David told him, “Look, tomorrow is the New Moon, and I’m supposed to sit down and eat with the king. Instead, let me go, and I’ll hide in the field until the third night.

Am I supposed to take my bread, my water, and my meat that I butchered for my shearers and give them to these men? I don’t know where they are from.”