Rig Veda 10.72.2 says as follows:
बरह्मणस पतिरेता सं कर्मार इवाधमत | देवानाम्पूर्व्ये युगे.असतः सदजायत ||
These Brahmaṇaspati produced with blast and smelting, like a Smith, Existence, in an earlier age of Gods, from Non-existence sprang.
Can anyone throw light on the inner/esoteric meaning of this mantra?