Hebrews 3:12
Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
Hebrews 7:5
And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham: