'Altar' in the Bible

And when he opened the fifth seal, I saw underneath the altar the souls of them that had been slain for the word of God, and for the testimony which they held:

And another angel came and stood over the altar, having a golden censer; and there was given unto him much incense, that he should add it unto the prayers of all the saints upon the golden altar which was before the throne.

And the angel taketh the censer; and he filled it with the fire of the altar, and cast it upon the earth: and there followed thunders, and voices, and lightnings, and an earthquake.

And the sixth angel sounded, and I heard a voice from the horns of the golden altar which is before God,

And there was given me a reed like unto a rod: and one said, Rise, and measure the temple of God, and the altar, and them that worship therein.

And another angel came out from the altar, he that hath power over fire; and he called with a great voice to him that had the sharp sickle, saying, Send forth thy sharp sickle, and gather the clusters of the vine of the earth; for her grapes are fully ripe.

And I heard the altar saying, Yea, O Lord God, the Almighty, true and righteous are thy judgments.