'Obligation' in the Bible

Therefore, brethren, it is not to our lower natures that we are under obligation that we should live by their rule.

Yes, they have kindly done this, and, in fact, it was a debt they owed them. For seeing that the Gentiles have been admitted in to partnership with the Jews in their spiritual blessings, they in turn are under an obligation to render sacred service to the Jews in temporal things.