Jeremiah 31:40

The whole valley of the dead bodies; a valley so called (as some think) from the multitude of Sennacherib's army slain there; or, (as others think,) from the bodies of malefactors put to death at Golgotha, (which was near,) cast or buried there. And of the ashes; so called (as is thought) from the ashes of the sacrifices carried thither. Some think that the horse gate had its name from the king's horses led out at it. The sum is, the whole city shall be built. Shall be holy unto the Lord; all these places shall be parts of the holy city, and God's name shall be sanctified, and he shall be worshipped in them all; and the city for a long time shall abide, and not be plucked up, nor thrown down; for we know after many years it was plucked up by the Romans. If we interpret the word for ever of a perpetuity, the church of God must here be understood, against which the gates of hell shall never prevail, as Christ hath promised.