'Sacred' in the Bible

which He promised beforehand through His prophets in the sacred Scriptures—

One person regards one day as better [or more important] than another, while another regards every day [the same as any other]. Let everyone be fully convinced (assured, satisfied) in his own mind.

He who regards the day as sacred, so regards it for the Master's sake; and he who eats certain food eats it for the Master's sake, for he gives thanks to God; and he who refrains from eating it refrains for the Master's sake, and he also gives thanks to God.

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.

Now to Him who has power to strengthen you according to my gospel and the proclamation about Jesus Christ, according to the revelation of the mystery kept silent for long ages