Khadiragrihyasutra 1.1.7

1.1.7

grīvāyāṃ pratimucya dakṣiṇaṃ bāhumuddhṛtya yajñopavītī bhavati / 7

After having sipped water three times, let him wipe off the water twice.
I, 1, 1. athâto grihyâkarmâny. 2. udagayanapûrvapakshapunyâheshu prâg âvartanâd anubhah kâloऽnâdese. 3. ऽpavarge yathotsâham brâhmanân âsayed. 4. yagñopavîtam sautram kausam vâ. 5. grîvâyâm pratimukya dakshinam bâhum uddhritya yagñopavîtî bhavati. 6. savyam prâkînâvîtî. 7. trir âkamyâpo dvih parimrigîta.