Impurities (Mala Vagga)
Verse 243
Pāli Source
Tato malā malataraṃ avijjā paramaṃ malaṃ; etaṃ malaṃ pahatvāna nimmalā hotha bhikkhavo.
English Translation
Beyond all these stains, ignorance is the greatest stain of all. Having let go of this stain, monks, become free of every stain.
Way to Enlightenment draft translation — not yet reviewed for accuracy.
Editorial Note
From the Mala Vagga (Impurities) — closes a list of various "stains" by naming ignorance (avijjā) as the deepest one.
Source
Pali critical edition: O. von Hinüber & K.R. Norman (Pali Text Society, 1995), digitized by the Dhammakaya Foundation via GRETIL, licensed CC BY-SA 4.0