The verse is -
sa vṛtrahendraḥ kṛṣṇayonīḥ purandaro dāsīrairayad vi | ajanayan manave kṣāmapaśca satrā śaṃsaṃ yajamānasya tūtot ||
Note the word dAsa in the above verse. Regarding who the dAsas were, in the Rig Veda translated by Jamison and Brereton, the authors write -
The people of the R̥ gveda refer to themselves as Āryas, which probably meant the “...