PB, 6, 7, 18.0 yajño vai devebhyo 'śvo bhūtvāpākrāmat taṃ devāḥ prastareṇāramayaṃs tasmād aśvaḥ prastareṇa saṃmṛjyamāna upāvaramate yad adhvaryuḥ prastaraṃ harati yajñasya śāntyā apratrāsāya //