First Letter of Peter

Because it is contained in Scripture, "Behold, I lay in Zion a chief cornerstone, elect, precious: He who believes in him will not be put to shame."

For you therefore who believe is the honor, but for such as are disobedient, "The stone which the builders rejected, Has become the chief cornerstone,"

and, "A stone of stumbling, and a rock of offense." For they stumble at the word, being disobedient, whereunto also they were appointed.

But you are a chosen race, a royal priesthood, a holy nation, a people for God's own possession, that you may show forth the excellencies of him who called you out of darkness into his marvelous light:

who in time past were no people, but now are God's people, who had not obtained mercy, but now have obtained mercy.