This refers to the altar that King Ahaz told Uriah to build.
# The bronze altar that was before Yahweh
This was the altar that the people of Israel had made long ago according to God's instructions.
# The bronze altar that was before Yahweh
The phrase "before Yahweh" is a metonym that refers to the place where Yahweh had shown his glory in the past. AT: "The bronze altar that was in front of the temple" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# from the front of the temple ... from between his altar and the temple of Yahweh