'Ought' in the Bible

Therefore if thou bring thy gift to the altar, and there rememberest that thy brother hath ought against thee;

And if any man say ought unto you, ye shall say, The Lord hath need of them; and straightway he will send them.

Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.