Nandanavagga

Suttapiṭaka · Saṁyuttanikāya · Sagāthāvaggasaṁyutta · Vol. 15 · Section 23

[23] 1. On one occasion the Blessed One was dwelling at Sāvatthī, in Jetavana, Anāthapiṇḍika's Park. There the Blessed One addressed the bhikkhus: "Bhikkhus!" "Venerable sir!" those bhikkhus replied to the Blessed One.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 4 other places

Vol. 15 · Section 863 — Dhajaggasutta
Vol. 15 · Section 847 — Sakkasaṅyuta
Vol. 15 · Section 613 — Aruṇavatīsutta
Vol. 15 · Section 855 — Susīmasutta