Hiranyakeshigrihyasutra 1.1.4.4

1.1.4.4

athainaṃ mekhalayā nābhideśe triḥ pradakṣiṇaṃ parivyayati \ dvirityeke \ yā duritā paribādhamānā śarmavarūthe punatī na āgāt \ prāṇāpānābhyāṃ balamāvahantī svasā devānāṃ subhagā mekhaleyam \ iti \4\

He then winds the girdle three times from left to right round (the boy, so that it covers) his navel. (He does so only) twice, according to some (teachers). (It is done) with (the verse), 'Here she has come to us who drives away sin, purifying our guard and our protection, bringing us strength by (the power of) inhalation and exhalation, the sister of the gods, this blessed girdle.'