Yeshayah 58:13

Orthodox Jewish Bible

¹³ 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: