References – AN 5.29: Walking Meditation 
Sutta / Aṅguttara Nikāya / AN 5: Pañcakanipāta / AN 5.29: Caṅkamasutta

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“Can jhana occur in walking meditation?” Answered by Ajahn Pasanno. [Jhāna] [Posture/Walking ] // [Concentration] [Ajahn Viradhammo]

Sutta: AN 5.29: Walking Meditatation.

The Four Foundations of Mindfulness [2015], Session 19, Excerpt 5