Visuddhimagga XII-4

Paṭhamajjhānato pana paṭṭhāya paṭipāṭiyā yāva nevasaññānāsaññāyatanaṃ, tāva punappunaṃ samāpajjanaṃ jhānānulomaṃ nāma.

（四）从初禅开始顺次而至非想非非想处，如是数数入定，故名「顺禅」。

Ñ(XII,4): (iv) Attaining again and again from the first jhāna up to the base consisting of neither perception nor non-perception is called in the order of the jhānas.

Nevasaññānāsaññāyatanato paṭṭhāya yāva paṭhamajjhānaṃ, tāva punappunaṃ samāpajjanaṃ jhānapaṭilomaṃ nāma.

（五）从非想非非想处开始逆次而至初禅，数数入定，故名「逆禅」。

Ñ: (v) Attaining again and again from the base consisting of neither perception nor non-perception back to the first jhāna is called in the reverse order of the jhānas.

Paṭhamajjhānato paṭṭhāya yāva nevasaññānāsaññāyatanaṃ, nevasaññānāsaññāyatanato paṭṭhāya yāva paṭhamajjhānanti evaṃ anulomapaṭilomavasena punappunaṃ samāpajjanaṃ jhānānulomapaṭilomaṃ nāma.

（六）从初禅开始而至非想非非想处，从非想非非想处开始而至初禅，如是以顺以逆数数入定，故名「顺逆禅」。

Ñ: (vi) Attaining in forward and reverse order, from the first jhāna up to the base consisting of neither perception nor non-perception and from the base consisting of neither perception nor non-perception back to the first jhāna, is called in the order and reverse order of the jhānas.