References – AN 3.86: Training (1st) 
Sutta / Aṅguttara Nikāya / AN 3: Tikanipāta / AN 3.86: Paṭhamasikkhāsutta

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Comment: Sīla requires quite a bit of thinking. [Virtue] [Directed thought and evaluation]

Response by Ajahn Pasanno. [Vinaya] [Arahant]

Sutta: AN 3.86: An arahant can commit offenses.

The Four Foundations of Mindfulness [2015], Session 45, Excerpt 10