Garudapurana 1.96.4

1.96.4

śūdrājjātastu cāṇḍālaḥ sarvavarṇavigarhitaḥ /
kṣattriyā māgadhaṃ vaiśyācchūdrā kṣattārameva ca //

Born from a śūdra is a Cāṇḍāla, despised by all castes.
From a vaiśya upon a kṣatriya woman is a Māgadha, and upon a śūdra woman a Kṣattṛ;