I just wanted to know the earliest Buddhist reference to the Bijakshara "Om" and the Syllables "Svaha".
Is there any Mahyana-specific explanation for "Om" & "Svaha" ? These are virtually contained in every other Dharanis & Mantras of Mahayana. I am expecting some early Mahayana Sutra to contain the explanation for the use of these syllables.
I am aware Om is explained in Vajrayana as the Vak, Kaya & Citta of the Buddhas. (If I remember from E-Sangha, Eijo quoted an east asian Tantric text where "Om" was considered referring to the Trikayas). I presume, the Tantric texts are dated much later, hence would have had time to come up with an Buddhist association for these.
yo dharmaṁ paśyati, sa buddhaṁ paśyati
One who sees the Dharma, sees the Buddha śālistamba sūtra
na pudgalo na ca skandhā buddho jñānamanāsravam
sadāśāntiṁ vibhāvitvā gacchāmi śaraṇaṁ hyaham
Neither a person nor the aggregates, the Buddha, is knowledge free from [evil] outflows
Clearly perceiving [him] to be eternally serene, I go for refuge [in him] saddharma-laṅkāvatāra-sūtra