Śatapatha Brāhmaṇa ("of a hundred paths") 1.3.1.14

1.3.1.14

sa vā abhivāsaḥ saṃnahyati | oṣadhayo vai vāso varuṇyā rajjustadoṣadhīrevaitadantardadhāti tatho haināmeṣā varuṇyā rajjurna hinasti tasmādabhivāsaḥ saṃnahyati

He girds her over the garment. Now the garment represents the plants, and (the cord represents) Varuna's noose (raggu): hence he thereby places the plants between (her and the noose), and thus that noose of Varuna does not injure her. This is the reason why he girds her over the garment.