I believe the tithe is binding upon the NT believer, and that, really, it is but a small amount. We ought to give more than 10% in "free will offerings" and in keeping with other opportunities for generosity that arise.
But to say that the tithe is done away with in the NT simply because a command enforcing it is not repeated, IMO is in error. As was noted above, the tithe is a pre-Mosaic ordinance, and carries through the Mosaic, Davidic and post exhilic establishments. Certainly this is not a part of the "types and shadows" of Sinai.
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Rev. Todd Ruddell
Pastor, Christ Covenant Reformed Presbyterian Church (RPCGA)
Wylie, TX
www.christcovenantreformedpc.org
Our best marks can contribute nothing to our justification, ...that is proper to faith. Faith cannot lodge in the soul alone, and without other graces; yet faith alone justifies before God.--G. Gillespie