Exodus 38:1 And he made the altar of burnt offering of shittim wood: five cubits was the length thereof, and five cubits the breadth thereof; it was foursquare; and three cubits the height thereof.
Exodus 38:2 And he made the horns thereof on the four corners of it; the horns thereof were of the same: and he overlaid it with brass.
Exodus 38:3 And he made all the vessels of the altar, the pots, and the shovels, and the basons, and the fleshhooks, and the firepans: all the vessels thereof made he of brass.
Exodus 38:4 And he made for the altar a brasen grate of network under the compass thereof beneath unto the midst of it.
Exodus 38:5 And he cast four rings for the four ends of the grate of brass, to be places for the staves.
Exodus 38:6 And he made the staves of shittim wood, and overlaid them with brass.
Exodus 38:7 And he put the staves into the rings on the sides of the altar, to bear it withal; he made the altar hollow with boards.
Numbers 16:38 The censers of these sinners against their own souls, let them make them broad plates for a covering of the altar: for they offered them before the LORD, therefore they are hallowed: and they shall be a sign unto the children of Israel.
The Altar of Sacrifice was the first article of furniture inside the gate of the court.
It was constructed of Brass, which was pure copper and Tin (not zinc as is used today).
The altar was a symbol of the cross. (It is where the sacrifices were made, all of which symbolized the death of Jesus on the cross)
The copper represented the purity of Jesus and the tin represented our sin, the two metals being melded into one symbolized the melding of Christ's divine nature with our human nature.
Isaiah 1:25 And I will turn my hand upon thee, and purely purge away thy dross, and take away all thy tin:
Ezra 8:27 Also twenty basons of gold, of a thousand drams; and two vessels of fine copper, precious as gold.
Malachi 3:3 And he shall sit as a refiner and purifier of silver: and he shall purify the sons of Levi, and purge them as gold and silver, that they may offer unto the LORD an offering in righteousness.
Leviticus 1: 11 And he shall kill it on the side of the altar northward before the LORD: and the priests, Aaron's sons, shall sprinkle his blood round about upon the altar.