Mahapadanasutta 1.35

1.35.1

Jāto kho pana, bhikkhave, vipassī kumāro mañjussaro ca ahosi vaggussaro ca madhurassaro ca pemaniyassaro ca.

From when he was born, his voice was charming, graceful, sweet, and endearing.

1.35.2

Seyyathāpi, bhikkhave, himavante pabbate karavīkā nāma sakuṇajāti mañjussarā ca vaggussarā ca madhurassarā ca pemaniyassarā ca;

It was as sweet as the song of a cuckoo-bird found in the Himalayas.

1.35.3

evameva kho, bhikkhave, vipassī kumāro mañjussaro ca ahosi vaggussaro ca madhurassaro ca pemaniyassaro ca.