Yeshayah 58:13-14

If thou turn away thy regel on account of Shabbos, from doing thy chefetz on My Yom Kodesh; and call Shabbos an Oneg (Delight), the Kedosh HASHEM (Holy Day of HASHEM), “honored”; and if thou shalt honor it, not doing thine darkhim nor finding thine own chefetz, nor speaking [worldly] words: Then shalt thou delight in HASHEM; and I will cause thee to ride upon the high places of eretz, and feed thee with the nachalat Ya'akov Avicha; for the mouth of HASHEM hath spoken.