Rev 9:12 concludes the first woe, providing the chronological marker that the sixth trumpet in 9:13 begins the second woe.

Revelation 8:3-5 introduces the golden altar and its link to prayer and judgment; here the voice from that altar commands the sixth trumpet.

Revelation 6:9 reveals souls under the altar; here the golden altar (of incense) is the source of a command — both involve the heavenly altar.

Hebrews 9:24 explains the earthly sanctuary was a copy; the golden altar in Revelation is the heavenly reality from which the voice speaks.

2 Chronicles 4:19 describes the golden altar in Solomon's temple, a copy of the heavenly altar from which the voice speaks in Revelation.

Luke 1:11 records an angel at the earthly altar of incense; similarly, a voice from the heavenly altar initiates judgment in Revelation.