If you don’t tithe you cut yourself off from the resources of heaven.
Bring ye all the tithes into the storehouse, that there may be meat in mine house, and prove me now herewith, saith the Lord of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it. And I will rebuke the devourer for your sakes, and he shall not destroy the fruits of your ground; neither shall your vine cast her fruit before the time in the field, saith the Lord of hosts. And all nations shall call you blessed: for ye shall be a delightsome land, saith the Lord of hosts. Malachi 3:10-12 KJV
To Tithe is to Honor.
Honour the Lord with thy substance, and with the firstfruits of all thine increase: So shall thy barns be filled with plenty, and thy presses shall burst out with new wine. Proverbs 3:9-10 KJV
Every Christian should honor God in the local church.
Every Pastor should have a Pastor and should honor their office with the tithe.