Paul, the apostle of the gentiles, never spoke of the tithe and the only time He spoke of contribution, was the collect for the poor brother of Judah. 2nd Cor. 9:
7- Every man according as he purposeth in his heart, [so let him give]; not grudgingly, or of necessity: for God loveth a cheerful giver.
The word offer or contribution already says all what is a voluntary gratitude to God; is not like those tethers do, Who force and scare people with Malachias curses 2- 6 to 12, text that is speaking only for the sons of Jacob (Israel). And also confirms in Hebrews 7-1 to 10.
   You only have to check in the texts, is how Jesus reprehended the Israeli Pharisees, demanding the fulfillment of the law and even the tithe in Matt. 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. (Read page. 91).
Jesus, praying to the father - John 17:
3- And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.
To have eternal life, is not only to know or accept Christ, but, put in practice the word of God and the teachings of Christ and the apostles, if not is denying Him and the Father.
  If someone wants the salvation, has to do like Zacchaeus, who wanted to meet Jesus, he tried hard (ran), humiliated himself (climbed the tree), took him to his house, and said: I decided to give half of everything I have to the poor, (love for the other) and, if I have taken anything from anyone, I give it back times four.
 (Fruit worthy of repentment and justice)  And there was transformation and salvation in that house (Luke. 19).