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Cite something from the Constitution itself.

I did. The signing portion is the most important part. It is under the authority of those Delegates that it has the legitimacy it possessed when it was sent to the states.

It acknowledged that Jesus was "Our Lord", and this wasn't a mere formality back in 1787.

It's precursor, the Articles of Confederation, was even more explicit.

And Whereas it hath pleased the Great Governor of the World to incline the hearts of the legislatures we respectively represent in Congress, to approve of, and to authorize us to ratify the said articles of confederation and perpetual union. Know Ye that we the undersigned delegates, by virtue of the power and authority to us given for that purpose, do by these presents, in the name and in behalf of our respective constituents, fully and entirely ratify and confirm each and every of the said articles of confederation and perpetual union, and all and singular the matters and things therein contained: And we do further solemnly plight and engage the faith of our respective constituents, that they shall abide by the determinations of the united States in congress assembled, on all questions, which by the said confederation are submitted to them. And that the articles thereof shall be inviolably observed by the States we respectively represent, and that the union shall be perpetual.
In Witness whereof we have hereunto set our hands in Congress. Done at Philadelphia in the State of Pennsylvania the ninth Day of July in the Year of our Lord one thousand seven Hundred and Seventy-eight, and in the Third Year of the independence of America.

But as for citing the Constitution, here's another bit of which most people are unaware.

If any Bill shall not be returned by the President within ten Days (Sundays excepted) after it shall have been presented to him, the Same shall be a Law, in like Manner as if he had signed it, unless the Congress by their Adjournment prevent its Return, in which Case it shall not be a Law.

The President was not required to work on the Sabbath because that would be a violation of Christian doctrine.