Happy is he who is able to provide himself with a complete suit of apparel down to the girdle, the shoes, and the hat for wearing on the Sabbath, different from those worn on week-days. Then he is to repeat the Book of Solomon's Song, and if unable to repeat the whole, he is, at all events, to repeat these four verses, the initials of the first word in each of which taken together form the word Jacob, Cant. i. 2, ii. 10, ii. 8, v. 1. After this he is to repeat certain portions of the Mishnah, and something of the Zohar or some other Kabbalistic work.
The Sabbath Custom of Reading the Song of Songs for Jacob
Kabbalistic Sabbath custom