חסידות אויף שמואל ב 8:13

And this is: Hashem, one, and His name — this is like Elohim, Kingship, as is written (Sam. II 8): "And David got him a name:" One (אחד=13) in gematria [see Appendix: Gematria] equals love (אהבה=13),

And this is what it says, "And Noah begot"—that the restfulness and settledness of Shabbat involves three levels: one, to acquire [an expression of the three levels of the soul:] nefesh-ruach-neshama on Shabbat. And one must prepare for this during the six weekdays—three [days] after Shabbat and three [days] before it. This is called "Shem" (a name), similar to "and David made a name for himself."