Revelation 9:13

The four horns of the golden altar - This is another not very obscure indication that the Jewish temple was yet standing.

And the sixth angel sounded - See the notes on Revelation 8:2, Revelation 8:7.

And I heard a voice from the four horns of the golden altar which is before God - In the language used here there is an allusion to the temple, but the scene is evidently laid in heaven. The temple in its arrangements was designed, undoubtedly, to be in important respects a symbol of heaven, and this idea constantly occurs in the Scriptures. Compare the Epistle to the Hebrews passim. The golden altar stood in the holy place, between the table of show-bread and the golden candlestick. See the notes on Hebrews 9:1-2. This altar, made of shittim or acacia wood, was ornamented at the four corners, and overlaid throughout with laminae of gold. Hence, it was called "the golden altar," in contradistinction from the altar for sacrifice, which was made of stone. Compare the notes on Matthew 21:12, following on its four corners it had projections which are called horns Exodus 30:2-3, which seem to have been intended mainly for ornaments. See Jahn, Arch. 332; Joseph. Ant. iii. 6, 8. When it is said that this was "before God," the meaning is, that it was directly before or in front of the symbol of the divine presence in the most holy place. This image, in the vision of John, is transformed to heaven. The voice seemed to come from the very presence of the Deity; from the place where offerings are made to God.

9:13 And the sixth angel sounded - Under this angel goes forth the second woe. And I heard a voice from the four corners of the golden altar - This golden altar is the heavenly pattern of the Levitical altar of incense. This voice signified that the execution of the wrath of God, mentioned verse s 20, 21, Rev 9:20,21 should, at no intercession, be delayed any longer.