Visuddhimagga IV-162

Yā pana ‘‘yasmiṃ samaye kāmāvacaraṃ kusalaṃ cittaṃ uppannaṃ hoti upekkhāsahagata’’nti (dha. sa. 150) evamāgatā adukkhamasukhasaññitā upekkhā, ayaṃ vedanupekkhā nāma.

（6）「在与舍俱的欲界善心生起之时」，如是说则称不苦不乐为舍，是名「受舍」。

Ñ(IV,162): Equanimity as a feeling is a name for the equanimity known as neither-pain-nor-pleasure described thus: 'On the occasion on which a sense-sphere profitable consciousness has arisen accompanied by equanimity' (Dhs. 156).

Notes in Chinese translation: 「受舍」（vedanupekkhā），《解脱道论》「受舍」。

Sayādaw U Sīlānanda: The word 'Equanimity' Sayādaw prefers to use 'neutral feeling'.