Ud.7/7. Ajakalāpakasuttaṃ
　　7. Evaṃ me sutaṃ – ekaṃ samayaṃ bhagavā pāvāyaṃ [pāṭaliyaṃ (pī.)] viharati ajakalāpake cetiye, ajakalāpakassa yakkhassa bhavane. Tena kho pana samayena bhagavā rattandhakāratimisāyaṃ abbhokāse nisinno hoti; devo ca ekamekaṃ phusāyati. Atha kho ajakalāpako yakkho bhagavato bhayaṃ chambhitattaṃ lomahaṃsaṃ uppādetukāmo yena bhagavā tenupasaṅkami; upasaṅkamitvā bhagavato avidūre tikkhattuṃ ‘‘akkulo pakkulo’’ti akkulapakkulikaṃ akāsi – ‘‘eso te, samaṇa, pisāco’’ti.
　　Atha kho bhagavā etamatthaṃ viditvā tāyaṃ velāyaṃ imaṃ udānaṃ udānesi –
　　‘‘Yadā sakesu dhammesu, pāragū hoti brāhmaṇo;
　　Atha etaṃ pisācañca, pakkulañcātivattatī’’ti. sattamaṃ;