This is the lowest skip occurrence searching for these two terms "first day of the week" and "the mark",

Both spellings are in Aramaic, from the Peshitta, found in Revelation.

The "first day of the week" is from Revelation 1.10, where the Sunday keepers (who DO bear the mark of
the beast) deliberately mistranslated the text, CHANGING IT
(Revelation 22.18+19) to "the lord's day":

I was in the Spirit on the Lord's day (the first day of the week - in Aramaic) , and heard behind me a great
voice, as of a trumpet,
 Revelation 1.10

And the mark is from Revelation 16.2:

And the first went, and poured out his vial upon the earth; and there fell a noisome and grievous sore
upon the men which had
the mark of the beast, and upon them which worshipped his image.  
                                                                                                                                             Revelation 16.2

And the main term goes through these verses:

And Samson said unto them, I will now put forth a riddle unto you: if ye can certainly declare it me within
seven days of the feast, and find it out, then I will give you thirty sheets and thirty change of
  Judges 14.12

When you go, you shall come to an unsuspecting people, and to a large land; for God has given
it to you at your hands; a place where there is no lack of anything that is in the Earth.
                                                                                                                            Judges 18.10 Koren Text
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"first day of the week" Tanakh @ 5706
From David Bauscher's Interlinear Peshitta