The Tipiṭaka in Three Languages

Saṅgāravasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 624

[624] "This, brahmin, is the cause, this is the reason why at times even hymns (mantā) that have not been recited over a long period become clear, not to speak of those that have been recited."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places