Garudapurana 1.58.23

1.58.23

vāmadakṣiṇato yuktā daśa tena caratyasau /
vārya (yva) granidravyasambhūto rathaścandrasutasyaca //

Yoked to the left and right are ten [horses], by which he traverses. / The chariot of the son of the Moon (Budha) is produced from water, fire, and sky;