Upakkilesasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 479

[479] Bhikkhus, the mindfulness factor of awakening (satisambojjhaṅga) is not an obstruction, not a hindrance (nīvaraṇa), not a corruption (upakkilesa) of the mind (citta); when developed and cultivated, it leads to the realization of the fruit of true knowledge and liberation (vijjāvimutti). …

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 19 · Section 491 — Āvaraṇanīvaraṇasutta