'Ought' in the Bible

This ought not to be, my sons! For the report that I hear circulating among the Lord's people is not good.

And they said, Thou hast not defrauded us, nor oppressed us, neither hast thou taken ought of any man's hand.

And he said unto them, The LORD is witness against you, and his anointed is witness this day, that ye have not found ought in my hand. And they answered, He is witness.

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.

And now I have heard that thou hast shearers: now thy shepherds which were with us, we hurt them not, neither was there ought missing unto them, all the while they were in Carmel.

Then answered all the wicked men and men of Belial, of those that went with David, and said, Because they went not with us, we will not give them ought of the spoil that we have recovered, save to every man his wife and his children, that they may lead them away, and depart.