Yāska's Nirukta 13.3

13.3

``yad udañco vṛsākape gṛham indrājagantana/
kvasya pulvagho mṛgaḥ kam agañjanayopano viśvasmād indra uttarah/''.
``yad udañco vṛkākapi8.gṛham indra ājagamatah,.kva asya pulvagho mṛgah,.kva sa bahvādī mṛgah/
mṛgo mārṣter gati karmaṇah/
kam agamad deśam jana yopanah/
sarvasmād ya indra uttaras tam etad brūma ādityam/
atha eṣā āditya raśmīnām/

"Since heading north, O Vṛṣākapi, you came to the house, O Indra,
where is his noxious beast? To what [place] has the bewilderer of people gone? Superior to all is Indra."
"Since heading north, O Vṛṣākapi, you came to the house, O Indra; where is his noxious beast? Where is that beast that devours much?"
*Mṛga* [beast] is from the root *mṛj* [to wipe/cleanse], meaning going.
To what region has the bewilderer of people gone?
He who is Indra, superior to all—him we declare to be Āditya.
Now this [verse] is of Āditya's rays: