Lakkhaṇasutta

Suttapiṭaka · Dīghanikāya · Pāthikavagga · Vol. 11 · Section 137

[137] Having known for himself the peril of death and slaughter, he abstained from putting others to death. By that good conduct he went to heaven, and there enjoyed the ripening that is the fruit of deeds well done. Having passed away, coming back here again, he obtains here three marks (lakkhaṇa): his heels are ample and long, and, upright as Brahmā, he is splendid, with well-formed limbs. Fair of arm, youthful, well-proportioned, well-born, his fingers are soft, tender, and long. By these three marks of a man they foretell that the boy will endure long: if he lives as a householder, he keeps going long; if he goes forth, then longer still than that he sustains life, through the development of mastery in psychic power (iddhi) — thus that is the sign of long life.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.