Dhātusaṅyutta

Suttapiṭaka · Saṁyuttanikāya · Nidānavaggasaṁyutta · Vol. 16 · Section 333

[333] He was dwelling at Sāvatthī. … "Bhikkhus, I will teach you the diversity of elements (dhātu). Listen to it and attend carefully; I will speak." "Yes, 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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 3 other places

Vol. 16 · Section 343 — Bāhiradhātusutta
Vol. 16 · Section 60 — Paccaysutta
Vol. 16 · Section 1 — Abhisamaysaṅyutta