Majjhima Nikaya 2:75
SUJATOKathañca, bhikkhave, bhikkhu vedanāsu vedanānupassī viharati?
And how does a mendicant meditate observing an aspect of feelings?
Kathañca, bhikkhave, bhikkhu vedanāsu vedanānupassī viharati?
And how does a mendicant meditate observing an aspect of feelings?