You may read the scripture below that are about tithing;
1 PETER 2 :9 But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:
REVELATION 1 : 6 And hath made us kings and priests unto God and his Father; to him be glory and dominion for ever and ever. Amen.
NUMBERS 18 : 26 Thus speak unto the Levites, and say unto them, When ye take of the children of Israel the tithes which I have given you from them for your inheritance, then ye shall offer up an heave offering of it for the Lord, even a tenth part of the tithe.


You may ask, 'since all those who believe in Jesus are priests, is it not unreasonable to pay tithes to another person?' The scriptures below will be of help to answering the question;


DEUTERONOMY 14 : 22 Thou shalt truly tithe all the increase of thy seed, that the field bringeth forth year by year. 23 And thou shalt eat before the Lord thy God, in the place which he shall choose to place his name there, the tithe of thy corn, of thy wine, and of thine oil, and the firstlings of thy herds and of thy flocks; that thou mayest learn to fear the Lord thy God always. 24 And if the way be too long for thee, so that thou art not able to carry it; or if the place be too far from thee, which the Lord thy God shall choose to set his name there, when the Lord thy God hath blessed thee: 25 Then shalt thou turn it into money, and bind up the money in thine hand, and shalt go unto the place which the Lord thy God shall choose: 26 And thou shalt bestow that money for whatsoever thy soul lusteth after, for oxen, or for sheep, or for wine, or for strong drink, or for whatsoever thy soul desireth: and thou shalt eat there before the Lord thy God, and thou shalt rejoice, thou, and thine household, 27 And the Levite that is within thy gates; thou shalt not forsake him; for he hath no part nor inheritance with thee. 28 At the end of three years thou shalt bring forth all the tithe of thine increase the same year, and shalt lay it up within thy gates: 29 And the Levite, (because he hath no part nor inheritance with thee,) and the stranger, and the fatherless, and the widow, which are within thy gates, shall come, and shall eat and be satisfied; that the Lord thy God may bless thee in all the work of thine hand which thou doest.
Additional scriptures, MATTHEW 23 :
23 Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.

Noted