Someone wrote on this forum: “Then in which scripture is it said to give 10%? I do believe the verse in Malachi, however, as inspired scripture.”
The verse in Malachi IS inspired Scripture. But that doesn’t mean Roman Catholics are obligated to follow it. We are not obligated to follow ANY of the Old Testament teachings on tithing. For example, in Sirach: “Glorify the Lord generously, and do not stint the first fruits of your hands. With every gift show a cheerful face, and dedicate your tithe with gladness.” - Sirach 35:8-9 (RSVCE)
Jesus Christ dispensed us from all of the Old Testament disciplines(circumcision, Sabbath (Saturday Celebration,) eating kosher food, tithing, etc.); these are replaced by the disciplines and Sacraments of the New Testament. So Malachi, and tithing, are firmly out.
“It [the holy Roman church] firmly believes, professes and teaches that the legal prescriptions of the old Testament or the Mosaic law, which are divided into ceremonies, holy sacrifices and sacraments, because they were instituted to signify something in the future, although they were adequate for the divine cult of that age, once our lord Jesus Christ who was signified by them had come, came to an end and the sacraments of the new Testament had their beginning. Whoever, after the passion, places his hope in the legal prescriptions and submits himself to them as necessary for salvation and as if faith in Christ without them could not save, sins mortally.”
Council of Florence, SESSION 11, 4 February 1442.”
This is the ultimate condemnation of tithing: “Whoever, after the passion, places his hope in the legal prescriptions (in this case, tithing) and submits himself to them as necessary for salvation and as if faith in Christ without them could not save, sins mortally."
The Church thus teaches very specifically that to believe that tithing grants salvation is a mortal sin. Tithing will not save us. Maintaining otherwise would be to equate the Old Testament teachings with those of the New. This really WOULD be a mortal sin.
Thus, it is a mortal sin to practice tithing as something that grants salvation. The above statement from the Council of Florence should put this issue to rest once and for all. If someone wishes to tithe out of their own arbitrary free will, that is fine. He/she would simply be exercising his/her own subjective, personal opinion on how they feel they should give, and nothing else. Nobody is obligated to follow such opinions.
But believing in tithing as a saving doctrine or as an official teaching of the Roman Catholic Church would be flatly wrong. Tithing does NOT grant us salvation. We do not have to practice tithing to be saved. Anyone who claims or practices otherwise “sins mortally,” according to the Council statement. This could not be more clear.