Majjhima Nikaya 2:83
SUJATOSāmisaṁ vā adukkhamasukhaṁ vedanaṁ vedayamāno ‘sāmisaṁ adukkhamasukhaṁ vedanaṁ vedayāmī’ti pajānāti.
When they feel a neutral feeling of the flesh, they know: ‘I feel a neutral feeling of the flesh.’
Sāmisaṁ vā adukkhamasukhaṁ vedanaṁ vedayamāno ‘sāmisaṁ adukkhamasukhaṁ vedanaṁ vedayāmī’ti pajānāti.
When they feel a neutral feeling of the flesh, they know: ‘I feel a neutral feeling of the flesh.’