Śatapatha Brāhmaṇa ("of a hundred paths") 3.5.3.25

3.5.3.25

atha laspūjanyā spandyayā prasīvyati | viṣṇoḥ syūrasītyatha granthiṃ karoti viṣṇordhruvo 'sīti nedvyaṃvapadyātā iti tam prakṛte karmanviṣyati tatho hādhvaryuṃ vā yajamānaṃ vā grāho na vindati tanniṣṭhitamabhimṛśati vaiṣṇavamasīti vaiṣṇavaṃ hi havirdhānam

With 'Thou art Vishnu's sewer,' he sews (the hurdles to the four door posts) with cord by means of a wooden pin. With, 'Thou art Vishnu's fixed (point),' he then makes a knot, 'lest it should fall asunder.' That same (knot) he undoes when the work is completed; and thus disease befalls not either the Adhvaryu or the Sacrificer. The completed (cart-shed) he touches with, 'Thou art Vishnu's own,' for the Soma-cart (and shed) belongs to Vishnu.