Melchizedek's Order
As noted elsewhere, tithing was not peculiar to the Law of Moses and the Old Covenant.
1For this Melchizedek, king of Salem, priest of God Most High, who met Abraham returning from the slaughter of the kings and blessed him, 2to whom also Abraham divided a tenth part of all (being first, by interpretation, “king of righteousness”, and then also “king of Salem”, which means “king of peace”; Hebrews 7:1,2
Melchizedek, a mysterious king during the time of Abraham, received tithes as a priest of God Most High. He is compared to the Son of God, as he has neither recorded birth or death, nor father or mother, nor any lineage recorded at all.
3without father, without mother, without genealogy, having neither beginning of days nor end of life, but made like the Son of God), remains a priest continually. 4Now consider how great this man was, to whom even Abraham, the patriarch, gave a tenth out of the best plunder. Hebrews 7:3,4
As the writer to the Hebrews says, the priesthood which later received tithes, paid tithes to this king, seeing how Levi, who was commanded to receive tithes from Israel, came from the lineage of Abraham.
5They indeed of the sons of Levi who receive the priest’s office have a commandment to take tithes of the people according to the law, that is, of their brothers, though these have come out of the body of Abraham, 6but he whose genealogy is not counted from them has accepted tithes from Abraham, and has blessed him who has the promises. 7But without any dispute the lesser is blessed by the greater. 8Here people who die receive tithes, but there one receives tithes of whom it is testified that he lives. 9We can say that through Abraham even Levi, who receives tithes, has paid tithes, 10for he was yet in the body of his father when Melchizedek met him. Hebrews 7:5-10
This fact shows several things, perhaps most importantly the superiority of the New Covenant, in which the Son of God would be ordained a priest eternally after Melchizedek's order. In light of this study, we are looking to the fact that this king received tithes from Abraham.
Because the Lord Jesus remains a high priest after Melchizedek's order, so does His entire Body, the Assembly. We have been called kings and priests unto God (Revelation 5:8-10) and therefore minister the Gospel as priests (Romans 15:15-16). Because we are one with Christ, we share in His priesthood, that of Melchizedek's order. Therefore, this testifies that those serving as priests or ministers of the Gospel, can and should receive tithes just as did Melchizedek. Paul shows this clearly in comparing support of the minister to the practice in the Old Covenant, that just as the priests of Moses' Law received tithes, so do the preachers of the Gospel live thereby.
13Don’t you know that those who serve around sacred things eat from the things of the temple, and those who wait on the altar have their portion with the altar? 14Even so the Lord ordained that those who proclaim the Good News should live from the Good News. 1 Corinthians 9:13,14
As the writer of Hebrews explains, because the priesthood of Yahweh has changed from the line of Aaron to the appointment of one eternal high priest—Jesus the Son of God—so has the Law changed (Hebrews 7:12). No more are tithes due to a physical genealogy, but to those who have been joined to Christ—a spiritual genealogy with God as the Father (Galatians 3:26) (1 John 4:4)—to serve in Christ as His priests or ministers.
7What soldier ever serves at his own expense? Who plants a vineyard, and doesn’t eat of its fruit? Or who feeds a flock, and doesn’t drink from the flock’s milk? 8Do I speak these things according to the ways of men? Or doesn’t the law also say the same thing? 9For it is written in the law of Moses, “You shall not muzzle an ox while it treads out the grain.” Is it for the oxen that God cares, 10or does he say it assuredly for our sake? Yes, it was written for our sake, because he who plows ought to plow in hope, and he who threshes in hope should partake of his hope. 1 Corinthians 9:7-10
So we see the concept of tithing continue throughout God's working with mankind. It continues even until today as the many Members of Christ's Body continue to serve as priests unto God, receiving tithes as unto Jesus Christ Himself, the eternal High Priest after the order of Melchizedek. Those who are ministering the Gospel to you, most often the pastor of your local Assembly, should receive your tithes unto Yahweh.