Exodus 30:1 And thou shalt make an altar to burn incense upon: of shittim wood shalt thou make it.
Exodus 30:2 A cubit shall be the length thereof, and a cubit the breadth thereof; foursquare shall it be: and two cubits shall be the height thereof: the horns thereof shall be of the same.
Exodus 30:3 And thou shalt overlay it with pure gold, the top thereof, and the sides thereof round about, and the horns thereof; and thou shalt make unto it a crown of gold round about.
Exodus 30:4 And two golden rings shalt thou make to it under the crown of it, by the two corners thereof, upon the two sides of it shalt thou make it; and they shall be for places for the staves to bear it withal.
Exodus 30:5 And thou shalt make the staves of shittim wood, and overlay them with gold.
Exodus 30:6 And thou shalt put it before the vail that is by the ark of the testimony, before the mercy seat that is over the testimony, where I will meet with thee.
Exodus 30:7 And Aaron shall burn thereon sweet incense every morning: when he dresseth the lamps, he shall burn incense upon it.
Exodus 30:8 And when Aaron lighteth the lamps at even, he shall burn incense upon it, a perpetual incense before the LORD throughout your generations.
Exodus 30:9 Ye shall offer no strange incense thereon, nor burnt sacrifice, nor meat offering; neither shall ye pour drink offering thereon.
Exodus 30:10 And Aaron shall make an atonement upon the horns of it once in a year with the blood of the sin offering of atonement's: once in the year shall he make atonement upon it throughout your generations: it is most holy unto the LORD.
This altar was constructed of shittim or acacia wood which was a long lasting wood, overlaid with pure gold .. This symbolizes the righteousness of Christ covering our sinfulness.
The incense symbolized the prayers of the saints mingled with the righteousness of Jesus:
Revelation 8:3 And another angel came and stood at the altar, having a golden censer; and there was given unto him much incense, that he should offer it with the prayers of all saints upon the golden altar which was before the throne.
Revelation 8:4 And the smoke of the incense, which came with the prayers of the saints, ascended up before God out of the angel's hand.