Gobhilagrihyasutra 2.2.16

2.2.16

avasiktāyāḥ savyena pāṇinā 'ñjalim upodgṛhya, dakṣiṇena pāṇinā dakṣiṇaṃ pāṇiṃ sāṅguṣṭham uttānaṃ gṛhītvai 'tāḥ ṣaṭ pāṇigrahaṇīyā japati gṛbhṇāmi ta iti.

After she has been (thus) besprinkled, he puts up her joined hands with his left hand, seizes with his right hand her right hand with the thumb, her hand being turned with the palm upwards, and murmurs these six verses referring to the seizing of (a girl's) hand, 'I seize thy hand' (MB. I, 2, 10-15).