Pārāyanavagga

Suttapiṭaka · Khuddakanikāya · Cūḷaniddesa · Vol. 30 · Section 14

[14] I too do not know this; knowledge (ñāṇa) of this is not found in me. The head (muddha) and the head-felling (muddhādhipāta) — for this is the seeing (dassana) of the Victors (jinā).

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.