Shatapatha Brahmana 7.1.1.30

7.1.1.30

atha tenaiva punaḥ parītya | dakṣiṇata udaṅṅā sīnaḥ pūrvayoruttarāmagra upadadhāti cidasi tayā devatayāṅgirasvadṛddhruvā sīdetyatha dakṣiṇām paricidasi tayā devatayāṅgirasvaddhruvā sīdeti

Thereupon, going round again by the same way, he sits down on the south side, with his face to the north, and puts on first the northern one of the two (bricks) in front, with (Vâg. S. XII, 53), 'Ranging thou art: by that deity, Aṅgiras-like, lie thou steady!' Then the southern one, with, 'Ranging round thou art: by that deity, Aṅgiras-like, lie thou steady'!'