References – DN 3: With Ambaṭṭha 
Sutta / Dīgha Nikāya / DN 3: Ambaṭṭhasutta

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“When the suttas describe a practitioner as “having gone beyond doubt,” (e.g. DN 3) what do they mean?” Answered by Ajahn Pasanno. [Doubt] [Sutta] // [Four Noble Truths] [Teaching Dhamma] [Ajahn Chah]

Story: An Ajahn Chah monk accused of a heavy offense. [Vinaya]

The Teaching and the Training [2018], Session 3, Excerpt 9