Dighanikaya 26.105

26.105

Āyatanti mahantaṃ. Pāṇātipātā virameyyāmāti pāṇātipātato osakkeyyāma. Pāṇātipātaṃ virameyyāmātipi sajjhāyanti, tattha pāṇātipātaṃ pajaheyyāmāti attho. Vīsativassāyukāti mātāpitaro pāṇātipātā paṭiviratā, puttā kasmā vīsativassāyukā ahesunti khettavisuddhiyā. Tesañhi mātāpitaro sīlavanto jātā. Iti sīlagabbhe vaḍḍhitattā imāya khettavisuddhiyā dīghāyukā ahesuṃ. Ye panettha kālaṃ katvā tattheva nibbattā, te attanova sīlasampattiyā dīghāyukā ahesuṃ.

"Great" means vast. "Let us abstain from taking life" means let us refrain from taking life. They also recite pāṇātipātaṃ virameyyāma, where the meaning is: let us abandon taking life. "Having a lifespan of twenty years": if the parents abstained from taking life, why did the children have a lifespan of twenty years? Because of the purity of the field. For their parents became virtuous. Thus, having grown within a virtuous womb, they were long-lived through this purity of the field. But those who passed away and were reborn right there became long-lived through the success of their own virtue.