O King, in the Tāmasa manvantara the sons of Vidhṛti, who were known as the Vaidhṛtis, also became demigods. Since in course of time the Vedic authority was lost, these demigods, by their own powers, protected the Vedic authority.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
देवा वैधृतयो नाम विधृतेस्तनया नृप । नष्टाः कालेन यैर्वेदा विधृताः स्वेन तेजसा
devā vaidhṛtayo nāma vidhṛtestanayā nṛpa | naṣṭāḥ kālena yairvedā vidhṛtāḥ svena tejasā
SB 8.1.29