'Debtor' in the Bible

Woe unto you, ye blind guides, that say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor.

And, Whosoever shall swear by the altar, it is nothing; but whosoever shall swear by the gift that is upon it, he is a debtor.

I am debtor both to Greeks and to Barbarians, both to the wise and to the foolish.

Yea, I testify again to every man that receiveth circumcision, that he is a debtor to do the whole law.