Charles Ellicott Commentary Isaiah 65:3

"a people that provoke me to my face continually, sacrificing in gardens, and burning incense upon bricks;" — Isaiah 65:3 (ASV)

That sacriflceth in gardens. —It is not without significance, as bearing on the date of the chapter, that the practice was common in Judah under Ahaz. (Comp. Isaiah 1:29,Micah 5:0; Ezekiel 20:28.)

Burneth incense upon altars of brick. —Literally, on the bricks, and possibly, therefore, on the roofs of houses, as was common in the idolatrous practices of Judah (2 Kings 23:12; Jeremiah 19:13). By some interpreters the words are referred, though with less probability, to the brick altars which the exiles are supposed to have used at Babylon, and were forbidden by the Law (Exodus 20:24–25).