'Supposed' in the Bible

"So tell them, 'The Lord, the God of Israel, says, "Every wine jar is made to be filled with wine."' And they will probably say to you, 'Do you not think we know that every wine jar is supposed to be filled with wine?'

Then the Lord said to me, “The [counterfeit] prophets are prophesying lies in My Name. I have neither sent them nor authorized them nor spoken to them. They are prophesying to you made-up visions [pretending to call forth responses from handmade gods], a worthless divination and the deceit of their own mind.

The Lord says, "The leaders of my people are sure to be judged. They were supposed to watch over my people like shepherds watch over their sheep. But they are causing my people to be destroyed and scattered.

Everyone was supposed to free their male and female Hebrew slaves. No one was supposed to keep a fellow Judean enslaved.