The thirtieth sutta of the Dīghanikāya.

It gives an account of the thirty-two special marks of a great man (mahāpurisalakkhaṇāni), which signify that their possessor will be either a world emperor (Cakkavatti) or a Buddha.

The sutta definitely states that these marks are entirely due to good deeds done in former births and can only be maintained in the present life by goodness. D.iii.142-79; the sutta is quoted in Mil. p.405.