Skandapurana 3.2.41.14

3.2.41.14

13. Now, in Dharmāraṇya to the west of Śambhu, on the occasion of describing the sacred field of Ravi, a detailed account of the birth of the two Aśvins, Nāsatya and Dasra, is related; there, in the narrative of Saṃjñā, the wife of Sūrya, Saṃjñā, unable to endure the heat of Sūrya, placed Chāyā near Sūrya and went away to perform tapas; Chāyā, through partiality in affection towards her own sons, cursed Yama when he raised his foot in anger to strike her; then, hearing the report about his mother related by Yama, Sūrya recognized through meditation that his own wife Saṃjñā was engaged in tapas in the form of a mare and went near her in the form of a horse; then, by entering his liṅga into the mare's nostrils, sexual union was performed by Sūrya, whereupon the twin Aśvins were born; from the place trampled by the eastern and western hooves of Sūrya who had assumed the form of a horse, two hot springs (Tapta-kuṇḍas) arose; the māhātmya of those two hot springs of Ravi is described; then Brahmā and the other gods installed Sūrya there under the name Bakulāditya; the installation of Saṃjñā and of the two boy Aśvins is related; the māhātmya of Ravi-kuṇḍa and Bakulārka is described; and an account of the reason for the renown of the name Bakulārka is given. (127 1)