Todalatantra 3.42

3.42

vahnijāyānvitā mantrā vijñeyāḥ praṇavādikāḥ
gaṅge cetyādinā devi tīrthamāvāhanaṃ caret //

Mantras joined with the wife of fire [svāhā] and beginning with the praṇava are to be known. / With ‘gaṅge ca’ and so on, O goddess, one should perform the invocation of the sacred bathing place.