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Page 99 of this account of The Buddhist Monastic Code list 11 types who should not be ordained as bhikkhus,
- a pandaka (essentially, a eunuch or a person born neuterβsee Sanghadisesa 2),
- a βnon-humanβ being, (this includes nagas, petas, devas, and yakkhas),
- a hermaphrodite,
- a person who poses as a bhikkhu without having been ordained,
- a bhikkhu who has ordained in another religion without first giving up his status as a bhikkhu,
- a person who has murdered his father,
- a person who has murdered his mother,
- a person who has murdered an arahant,
- a person who has sexually molested a bhikkhuni,
- a person who has maliciously injured a Buddha to the point of causing him to bleed, and
- a person who has dishonestly caused a schism in the Sangha, knowing or suspecting that his position was contrary to the Dhamma-Vinaya.
Pages 44 through 98 describe just four parajika rules, where if a bhikkhu breaks (or has broken) one of these rules then they are automatically no longer a bhikkhu and cannot ordain again in this life: