The two Ashvins, practising severe penances, have been said to be Shudras. The deities sprung from Angirasa's family have been said to be Brahmanas. This is certain.
अश्विनौ तु स्मृतौ शूद्रौ तपस्युगे समास्थितौ। स्मृतास्त्वङ्गिरसो देवा ब्राह्मणा इति निश्चयः॥