'Altar' in the Bible

When He (the Lamb) broke open the fifth seal, I saw underneath the altar the souls of those who had been slaughtered because of the word of God, and because of the testimony which they had maintained [out of loyalty to Christ].

Another angel came and stood at the altar. He had a golden censer, and much incense was given to him, so that he might add it to the prayers of all the saints (God’s people) on the golden altar in front of the throne.

So the angel took the censer and filled it with fire from the altar, and hurled it to the earth; and there were peals of thunder and loud rumblings and sounds and flashes of lightning and an earthquake.

Then the sixth angel sounded [his trumpet], and I heard a solitary voice from the four horns of the golden altar which stands before God,

Then there was given to me a measuring rod like a staff; and someone said, “Rise and measure the temple of God and the altar [of incense], and [count] those who worship in it.

And another angel came from the altar, the one who has power over fire; and he called with a loud voice to him who had the sharp sickle, saying, “Put in your sharp sickle and reap the clusters of grapes from the vine of the earth, because her grapes are ripe [for judgment].”

And I heard [another from] the altar saying, “Yes, O Lord God, the Almighty [the Omnipotent, the Ruler of all], Your judgments are true and fair and righteous.”