The Tipiṭaka in Three Languages

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Vinayapiṭaka · Cūḷavagga (2) · Vol. 7 · Section 374

[374] Furthermore, bhikkhus, here a certain teacher, being one whose Dhamma teaching (dhammadesanā) is impure, claims: "I am one whose Dhamma teaching is pure" … Such a teacher, bhikkhus, his disciples protect with regard to his Dhamma teaching; and such a teacher expects protection from his disciples with regard to his Dhamma teaching.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 3 other places