Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 9.6

9.6

tatra suptaṃ mahātmānaṃ brahmalokanivāsinaḥ /
bhṛgvādiṛṣayaḥ sarve ye cānye sanakādayaḥ //

There, the dwellers of the realm of Brahmā, all the sages beginning with Bhṛgu, / and whoever others beginning with Sanaka [saw] the great-souled one asleep;