Epistle of Barnabas

Let us further inquire whether the Lord took any care to foreshadow the water [of baptism] and the cross. Concerning the water, indeed, it is written, in reference to the Israelites, that they should not receive that baptism which leads to the remission of sins, but should procure another for themselves. The prophet therefore declares, "Be astonished, O heaven, and let the earth tremble at this, because this people hath committed two great evils: they have forsaken Me, a living fountain, and have hewn out for themselves broken cisterns. Is my holy hill Zion a desolate rock? For ye shall be as the fledglings of a bird, which fly away when the nest is removed."