'Altar' in the Bible

You put unclean bread on my altar. And you say, How have we made it unclean? By your saying, The table of the Lord is of no value.

If only there was one among you who would see that the doors were shut, so that you might not put a light to the fire on my altar for nothing! I have no pleasure in you, says the Lord of armies, and I will not take an offering from your hands.

And this again you do: covering the altar of the Lord with weeping and with grief, so that he gives no more thought to the offering, and does not take it with pleasure from your hand.