I think the most convincing passage against the continuing status of the Sabbath is...

Therefore no one is to act as your judge in regard to food or drink or in respect to a festival or a new moon or a Sabbath day-- things which are a mere shadow of what is to come; but the substance belongs to Christ.
(Col 2:16-17)

Yet, when understood properly this passage is speaking of the Sabbaths that were part of the ceremonial law, which took place during the "new moons" and "festivals"...not the weekly Sabbath which is a moral law as is proved by it being part of the Decalogue.

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Larry Bray
Elder - Reformed Presbyterian Church of Boothwyn, PCA
Boothwyn, PA - http://www.rpcb.org/
Free Online Reformed Seminary - http://www.tnars.net
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“The Christian must not be of such a complying nature as to cut the coat of his profession according to the fashion of the times…" - William Gurnall