'Ought' in the Bible
Then Abimelech called Abraham and said to him, “What have you done to us? And how have I sinned against you, that you have brought on me and on my kingdom a great sin? You have done to me things that ought not to be done.”
Now the sons of Jacob came in from the field when they heard it; and the men were grieved, and they were very angry because he had done a disgraceful thing in Israel by lying with Jacob’s daughter, for such a thing ought not to be done.
So David said to Jonathan, “Behold, tomorrow is the new moon, and I ought to sit down to eat with the king. But let me go, that I may hide myself in the field until the third evening.
Now therefore, do not let him go unpunished, for you are a wise man; and you will know what you ought to do to him, and you will bring his gray hair down to Sheol with blood.”