1 Peter 2:4-8:
“Come to him, to that living stone, rejected by men but in God’s sight chosen and precious; and like living stones be yourselves built into a spiritual house, to be a holy priesthood, to offer spiritual sacrifices acceptable to God through Jesus Christ. For it stands in scripture: ‘Behold, I am laying in Zion a stone, a cornerstone chosen and precious, and he who believes in him will not be put to shame.’ To you therefore who believe, he is precious, but for those who do not believe, ‘The very stone which the builders rejected has become the head of the corner,’ and ‘A stone that will make men stumble, a rock that will make them fall,’ for they stumble because they disobey the word, as they were destined to do.”
Jesus, Himself, is the living stone. The scriptures quoted within this bible text are from Psalm 118:22 and Is. 28:16. So we are called to be like Jesus, like living stones.
This is from the Jerome Biblical Commentary:
“Christians are ‘living stones’ not just as persons contrasted with the inanimate blocks used in pagan temples but as persons vivified by the life of Christ himself in baptism. So united to Christ, the cornerstone, they form a new unit”