Khuddakavatthukkhandhaka

Vinayapiṭaka · Cūḷavagga (2) · Vol. 7 · Section 69

[69] Now at that time bhikkhus, having propped up the kathina frame (kaṭhina) against a wall or against a pillar, departed. The kathina frame toppled over and broke. They reported this matter to the Blessed One. "Bhikkhus, I allow it to be hung on a wall-peg or on an elephant-tusk peg (nāgadantaka)."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 3 other places

Vol. 7 · Section 45 — Khuddakavatthukkhandhaka
Vol. 7 · Section 232 — Senāsanakkhandhaka
Vol. 7 · Section 49 — Khuddakavatthukkhandhaka