Pāli · Sutta Piṭaka (Pāli, Mahāsaṅgīti)Seyyathāpi, rāhula, rañño nāgo īsādanto urūḷhavā abhijāto saṅgāmāvacaro saṅgāmagato purimehipi pādehi kammaṁ karoti, pacchimehipi pādehi kammaṁ karoti, purimenapi kāyena kammaṁ karoti, pacchimenapi kāyena kammaṁ karoti, sīsenapi kammaṁ karoti, kaṇṇehipi kammaṁ karoti, dantehipi kammaṁ karoti, naṅguṭṭhenapi kammaṁ karoti; rakkhateva soṇḍaṁ. Tattha hatthārohassa evaṁ hoti: ‘ayaṁ kho rañño nāgo īsādanto urūḷhavā abhijāto saṅgāmāvacaro saṅgāmagato purimehipi pādehi kammaṁ karoti, pacchimehipi pādehi kammaṁ karoti …pe… naṅguṭṭhenapi kammaṁ karoti; rakkhateva soṇḍaṁ. Apariccattaṁ kho rañño nāgassa jīvitan’ti. Yato kho, rāhula, rañño nāgo īsādanto urūḷhavā abhijāto saṅgāmāvacaro saṅgāmagato purimehipi pādehi kammaṁ karoti, pacchimehipi pādehi kammaṁ karoti …pe… naṅguṭṭhenapi kammaṁ karoti, soṇḍāyapi kammaṁ karoti, tattha hatthārohassa evaṁ hoti: ‘ayaṁ kho rañño nāgo īsādanto urūḷhavā abhijāto saṅgāmāvacaro saṅgāmagato purimehipi pādehi kammaṁ karoti, pacchimehipi pādehi kammaṁ karoti, purimenapi kāyena kammaṁ karoti, pacchimenapi kāyena kammaṁ karoti, sīsenapi kammaṁ karoti, kaṇṇehipi kammaṁ karoti, dantehipi kammaṁ karoti, naṅguṭṭhenapi kammaṁ karoti, soṇḍāyapi kammaṁ karoti. Pariccattaṁ kho rañño nāgassa jīvitaṁ. Natthi dāni kiñci rañño nāgassa akaraṇīyan’ti.
Evameva kho, rāhula, yassa kassaci sampajānamusāvāde natthi lajjā, nāhaṁ tassa kiñci pāpaṁ akaraṇīyanti vadāmi. Tasmātiha te, rāhula, ‘hassāpi na musā bhaṇissāmī’ti— evañhi te, rāhula, sikkhitabbaṁ.
English · Bhikkhu SujatoSuppose there was a royal bull elephant with tusks like draft-poles, able to draw a heavy load, pedigree and battle-hardened. In battle it uses its fore-feet and hind-feet, its fore-quarters and hind-quarters, its head, ears, tusks, and tail, but it still protects its trunk. So its rider thinks: ‘This royal bull elephant still protects its trunk. It has not yet given its life.’ But when that royal bull elephant … in battle uses its fore-feet and hind-feet, its fore-quarters and hind-quarters, its head, ears, tusks, and tail, and its trunk, its rider thinks: ‘This royal bull elephant … in battle uses its fore-feet and hind-feet, its fore-quarters and hind-quarters, its head, ears, tusks, and tail, and its trunk. It has given its life. Now there is nothing that royal bull elephant would not do.’
In the same way, when someone is not ashamed to tell a deliberate lie, there is no bad deed they would not do, I say. So you should train like this: ‘I will not tell a lie, even for a joke.’