Many truths of the Old Testament Bible are given as an example, a type, or foreshadowing of Christ and His Word in the New Testament. One such example is the temple that Solomon, David’s son, built. The first temple built for the Lord was in Jerusalem. It is recorded in 2 Chronicles 3:1, “Then Solomon began to build the house of the Lord at Jerusalem in mount Moriah, where the Lord appeared unto David his father, in the place that David had prepared in the threshingfloor of Ornan the Jebusite.” Consider the type that the building was on a threshing floor.
A threshing floor, in Bible times, were agricultural spaces where crops were threshed and winnowed. (In parts of the world today that same process is still vital to food supplies). Some descriptions of how this threshing process was actually carried forth was, “sheaves of grain would be opened up and the stalks spread across the threshing floor. Pairs of donkeys or oxen (or sometimes cattle, or horses) would then be walked round and round, often dragging a heavy threshing board behind them, to tear the ears of grain from the stalks, and loosen the grain itself from the husks.” The grain, to be useful, had to be separated from the outer shell.
David was instructed to build an altar at the threshing floor in 2 Samuel 24:18 & 19, “And Gad came that day to David, and said unto him, Go up, rear an altar unto the LORD in the threshingfloor of Araunah the Jebusite. And David, according to the saying of Gad, went up as the LORD commanded.” The threshing floor was to represent a place where a separating process could divide between that which was useless, and the desired grain could be utilized.
In a spiritual sense this represented a judgment and separation from sin. In the Word of God the mention, or introduction, of an altar means a place of sacrifice. In other words, something had to die. It is important to note that, in this type, before there could be a house of God, there had to be the threshing floor (judgment) and the altar (sacrifice). Any place, and in any location, where the house of God will be established there will first be the judgment of sin and a sacrifice.
“…Christ is the head of the church:…” (Ephesians 5:23) He purchased it with Own His Redeeming Blood. In 1 Corinthians 6:20 Paul writes, “…ye are bought with a price…” This great Eternal Salvation is free to all who will believe and repent of their sin, but it cost Christ everything to become our Substitute for sin. He gave His Sinless and Perfect Life.  The church today is as it has always been; it is built on the cross of Christ.  There is no church without His life, death, burial and resurrection.
Though God’s salvation is a free gift, we owe Christ everything. In Romans 12:1, Paul tells us our reasonable service to our Redeemer with these words, “I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.” David also knew he was to present to God an offering. He said in 1 Chronicles 21:28, “At that time when David saw that the Lord had answered him in the threshingfloor of Ornan the Jebusite, then he sacrificed there.” He realized that was more than a natural threshing floor, he said, “…This is the house of the Lord God, and this is the altar of the burnt offering for Israel.” (1 Chronicles 22:1)
When David was to offer sacrifice in 2 Samuel 24:24, when He was offered property at no cost, he replied, “…Nay; but I will surely buy it of thee at a price: neither will I offer burnt offerings unto the Lord my God of that which doth cost me nothing…”
We must go to Christ for the forgiveness of sin, but we must be willing to be emptied of everything that is not of Christ (threshing floor experience). Additionally, the altar is where we present ourselves as a living sacrifice (Romans 12:1) to God.  Thank God for His wonderful ways and works among us.