Apostles did not immediately come to understand the role of the Jewish law for salvation, but even when they came to this understanding (that it does not matter for salvation), they continued to observe the law for the sake of unbelieving Jews, so as not to tempt them. Of course, the tithe is only a part of the Old Testament law, it was for given to the Levites, to the temple, to the beggars. Apostles or community leaders of the ancient church never collected tithes because the law of tithing does not for given of tithe to them. In the Jerusalem community during the existence of the Temple, most likely members of the community gave tithes for the temple, as required by law.
But the attitude to the law of Jerusalem apostles were careful. in Gal. 2: 11-16 Paul talks about the hypocrisy of Peter (following Peter, other apostles also dissembled according to him). The behavior of apostle Peter can be explained not by hypocrisy (as Paul understood), but by his desire to avoid temptation in the eyes of Jerusalem's Judeo-Christians, condescension to their "weak faith" (in the language of the apostle Paul, see Romans 14: 1-2), especially if we consider that this event occurred before the Apostolic Council.
Most likely, Apostle of the Gentiles sharply opposed the claims of the zealots of the law (Acts 15: 1-2) and expected that they seeing Peter's cordial attitude towards the Gentiles would also recognize them as their full-fledged coreligionists. But Peter began to behave in a different way. Paul described the behavior of Peter as "hypocrisy", and attacked him with denunciation. But Paul's sharp speech against the zealots of the law in the eyes of Peter could look like a manifestation of extreme unceremoniousness toward converted Jews. Apostle Peter, unlike Paul, was, apparently, a supporter of the sensitive settlement of disputes of this kind. Most likely, he thought that his fellow believers from the Jerusalem community were not yet mature enough to recognize a fraternal union with converted uncircumcised coreligionists. That's why Peter did not here to support Paul, and this caused irritation of Paul.
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