Comment: You can preach and should preach

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In reply to comment: Exactly. (see in situ)

You can preach and should preach

the truth always. And the fact that Paul in this one verse met with the disciples on the first day does not make the first day the new sabbath. The Sabbath is the Seventh day as Commanded.

Now you see in that verse that He kept the Days of Unleavened which IS a Scriptural feast day and is backed up by numerous and direct passages but how many Christians do you know who keep it?