Garudapurana 1.58.29

1.58.29

samāruhya śanairyāti mandagāmī śanaiścaraḥ /
svarbhānosturagā hyaṣṭau bhṛṅgābhā dhūsaraṃ ratham //

Śanaiścara (Saturn), moving slowly, proceeds gradually. / The eight horses of Svarbhānu (Rāhu), resembling black bees, [draw] a dusky chariot;