Śatapatha Brāhmaṇa ("of a hundred paths") 8.1.2.7

8.1.2.7

atha madhye | iyamupari matiriti candramā vā upari tadyattamāhoparotyupari hi candramā atha yanmatirityāha vāgvai matirvācā hīdaṃ sarvam manute vāggha candramā bhūtvopariṣṭāttasthau tadeva tadrūpamupadadhāti

Then in the centre, with (Vâg. S. XIII, 58), 'This one, above, the mind,'--above, doubtless, is the moon; and as to why he speaks of him as (being) 'above,' the moon is indeed above; and as to why he says, 'the mind,' the mind (mati), doubtless, is speech, for by means of speech everything thinks (man) here. The moon, having become speech, remained above: it is that form he now bestows (on. Agni).