Jaiminīya (Talavakāra) Brāhmaṇa 54.289

Between them is the Yajñāyajñīya. / Cattle indeed are the Yajñāyajñīya. / Having driven up those very cattle and having checked [them], they arise. / These two indeed are Prajāpati's out-breath and in-breath. / In that there are the Utsedha and Niṣedha, thereby they thrive with out-breath and in-breath. / Indeed, these two sāmans are the distributor of good and bad fortune. / This tenth day is a king's assembly. / For in an assembly, they drive away upwards and drive down one who speaks improperly as worse. / In that the Utsedha and Niṣedha are present, it is for the driving up and driving down of good and bad fortune. / Speech indeed is the Yajñāyajñīya. / It is between the Utsedha and Niṣedha. / The self indeed is speech; / the Utsedha and Niṣedha are out-breath and in-breath. / In that the Yajñāyajñīya is between the Utsedha and Niṣedha, they thereby grasp the self on both sides with out-breath and in-breath. / Therefore speech is grasped by out-breath and in-breath.

Splendor indeed is the Yajñāyajñīya; the midday is the self.

In that they bring back the Yajñāyajñīya towards the midday, they establish splendor in the self itself.

With the Yajñāyajñīya indeed, on the preceding days, they proceed implanting embryos.

On the tenth day they cause it to move from the womb.