snānaṁ tri-ṣavaṇaṁ caret

pratipat-dinam-on the day of pratipat; arabhya-beginning; yavat-until; sukla-of the bright fortnight; trayodasim-the thirteenth day of the moon (the second day after Ekadasi); brahmacaryam-observing complete celibacy; adhah-svapnam-lying down on the floor; snanam-bathing; tri-savanam-three times (morning, evening and noon); caret-one should execute.