Majjhima Nikaya 2:88
SUJATOEvampi kho, bhikkhave, bhikkhu vedanāsu vedanānupassī viharati.
That’s how a mendicant meditates by observing an aspect of feelings.
Evampi kho, bhikkhave, bhikkhu vedanāsu vedanānupassī viharati.
That’s how a mendicant meditates by observing an aspect of feelings.