Shatapatha Brahmana 4.5.8.15

4.5.8.15

atha yadi rathaṃ vā yuktaṃ dāsyantsyāt | yadvā vaśāyai vā vapāyāṃ hutāyāṃ dadyādudavasānīyāyāṃ veṣṭau

And should he intend to give a cart yoked (with a team of oxen), or something else, let him give it either after the offering of the omentum of the barren cow, or at the concluding (udavasânîyâ) offering.