¹⁹ They went out from us,^(A) but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us.^(B)

On Denying the Incarnation

4 Dear friends,^(A) do not believe every spirit,^(B) but test the spirits to see whether they are from God, because many false prophets have gone out into the world.^(C)