The Tipiṭaka in Three Languages

Saṅgāravasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 613

[613] "This, brahmin, is the cause, this is the condition why at times even hymns (mantā) that have long been recited do not recur to the mind, still less those that have not been recited."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places