R. Scott Clark had a recent post on this. I'm not convinced by his argument, but I thought I'd point it out.

I find it strange that the WCF uses 1 Cor. 16:2 to justify the first day of the week as the Sabbath yet doesn't recognize the offering as an element of worship.

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Scott Roper
Member, Redeemer Presbyterian Church (PCA): "A bunch of hippie Calvinists"
Winston-Salem, NC