'Ought' in the Bible

Then Abimelech called Abraham and said to him, “What have you done to us? And how have I offended you that you have brought on me and my kingdom a great sin? You have done to me what ought not to be done [to anyone].”

Now when Jacob’s sons heard of it they came in from the field; they were deeply grieved, and they were very angry, for Shechem had done a disgraceful thing to Israel by lying with Jacob’s daughter, for such a thing is not to be done.