'Altar' in the Bible

When the Lamb broke the fifth seal, I saw at the foot of the altar the souls of those whose lives had been sacrificed because of the word of God and of the testimony which they had given.

And another angel came and stood close to the altar, carrying a censer of gold; and abundance of incense was given to him that he might place it with the prayers of all God's people upon the golden altar which was in front of the throne.

So the angel took the censer and filled it with fire from the altar and flung it to the earth; and there followed peals of thunder, and voices, and flashes of lightning, and an earthquake.

The sixth angel blew his trumpet; and I heard a single voice speaking from among the horns of the golden incense altar which is in the presence of God.

Then a reed was given me to serve as a measuring rod; and a voice said, "Rise, and measure God's sanctuary--and the altar--and count the worshipers who are in it.

And another angel came out from the altar--he who had power over fire--and he spoke in a loud voice to him who had the sharp sickle, saying, "Use your sharp sickle, and gather the bunches from the vine of the earth, for its grapes are now quite ripe."

And I heard a voice from the altar say, "Even so, O Lord God, the Ruler of all, true and righteous are Thy judgments."