Kayagatasatisutta 18.4

18.4

evameva kho, bhikkhave, bhikkhu imameva kāyaṃ vivekajena pītisukhena abhisandeti parisandeti paripūreti parippharati; nāssa kiñci sabbāvato kāyassa vivekajena pītisukhena apphuṭaṃ hoti.

In the same way, a mendicant drenches, steeps, fills, and spreads their body with rapture and bliss born of seclusion. There’s no part of the body that’s not spread with rapture and bliss born of seclusion.