'Ought' in the Bible

But woe unto you Pharisees! for ye tithe mint and rue and every herb, and pass over justice and the love of God: but these ought ye to have done, and not to leave the other undone.

for the Holy Spirit shall teach you in that very hour what ye ought to say.

And the ruler of the synagogue, being moved with indignation because Jesus had healed on the sabbath, answered and said to the multitude, There are six days in which men ought to work: in them therefore come and be healed, and not on the day of the sabbath.

And ought not this woman, being a daughter of Abraham, whom Satan had bound, lo, these eighteen years, to have been loosed from this bond on the day of the sabbath?

And he spake a parable unto them to the end that they ought always to pray, and not to faint;