'Sacred' in the Bible

Do ye not know that they who labour at sacred things eat of the offerings offered in the temple; they that attend at the altar partake with the altar?

and that from a child thou hast known the sacred letters, which are able to make thee wise unto salvation, through faith which is in Christ Jesus.

that the elder women in like manner be in deportment as becoming those who have to say to sacred things, not slanderers, not enslaved to much wine, teachers of what is right;