Albert Barnes Commentary Jeremiah 19:13

"and the houses of Jerusalem, and the houses of the kings of Judah, which are defiled, shall be as the place of Topheth, even all the houses upon whose roofs they have burned incense unto all the host of heaven, and have poured out drink-offerings unto other gods." — Jeremiah 19:13 (ASV)

Because of all - literally, “with reference to all,” limiting the denunciation to those houses whose roofs had been defiled with altars.

On whose roofs they have burned incense - See 2 Kings 23:12, note.