'Ought' in the Bible

Then Abimelech called Abraham, and said to him, "What have you done to us? How have I sinned against you, that you have brought on me and on my kingdom a great sin? You have done deeds to me that ought not to be done!"

The sons of Jacob came in from the field when they heard it. The men were grieved, and they were very angry, because he had done folly in Israel in lying with Jacob's daughter; a which thing ought not to be done.

She answered him, "No, my brother, do not force me! For no such thing ought to be done in Israel. Don't you do this folly.

Now therefore don't hold him guiltless, for you are a wise man; and you will know what you ought to do to him, and you shall bring his gray head down to Sheol with blood."

Of the children of Issachar, men who had understanding of the times, to know what Israel ought to do, the heads of them were two hundred; and all their brothers were at their commandment.

Then David said, "No one ought to carry the ark of God but the Levites. For Yahweh has chosen them to carry the ark of God, and to minister to him forever."

Ought you not to know that Yahweh, the God of Israel, gave the kingdom over Israel to David forever, even to him and to his sons by a covenant of salt?

Also I said, "The thing that you do is not good. Ought you not to walk in the fear of our God, because of the reproach of the nations our enemies?