Exodus 30:1 says, And thou shalt make an altar to burn incense upon: of shittim wood shalt thou make it.  Next they were to build an altar to burn incense.  Verse two states, 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.  The altar was to be square, but twice as high as it was long on each side.  Verse three adds, 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.  This altar was also to be covered with gold and to have horns on it.  God expects the very best to be given when we serve Him.  As followers of Christ, this is not just the best of what we have but of the best that we are also.  Verse four says, 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.  Thi altar was also to be made with rings to make it mobile.  The altar was to move with the people of Israel, just as the Holy Spirit moves with Christians today.  Vere five states, And thou shalt make the staves of shittim wood, and overlay them with gold.  The people of Israel were to make staves overlaid with gold to be used to transport the altar.  Verse six declares, 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.  This altar was to be placed before the veil of the ark of testimony and before the mercy seat.  Then, God said He would meet them there.  When we are obedient to God"s instructions, we can be certain that He will meet us where we are.  Verse seven adds, And Aaron shall burn thereon sweet incense every morning: when he dresseth the lamps, he shall burn incense upon it.  Matthew Henry says that they were to burn incense to overcome the smell of the burnt offerings that were offered in the tabernacle.  Aaron was to do this in the morning and at night.  Verse eight says, And when Aaron lighteth the lamps at even, he shall burn incense upon it, a perpetual incense before the LORD throughout your generations.  As just stated, this was to be done morning and night perpetually.  This was to be a sweet incense unto the LORD.  Our worship should always be sweet to God and should always be a perpetual worship.  We are not to just worship God when we are in the church building, or during the good times, but we are to worship Him at all times.  Verse nine adds, Ye shall offer no strange incense thereon, nor burnt sacrifice, nor meat offering; neither shall ye pour drink offering thereon.  They were to only use the altar for the purpose that God intended it to be used for.  Matthew Henry states that there was no grate to this altar, but that a golden censer was brought with coals upon it and with it all the coals were taken away.  Verse ten concludes, And Aaron shall make an atonement upon the horns of it once in a year with the blood of the sin offering of atonements: once in the year shall he make atonement upon it throughout your generations: it is most holy unto the LORD.  Once a year, Aaron was to make atonement with blood upon the horns for a sin offering.  This was to purify the altar.  Christ is the only One Who can purify us today, and this can only occur if we put our faith in Him and His sacrifice for us on the cross.  When we do accept Christ as our Savior and Lord, then we are to be perpetually in the presence of God.