Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.5.26

5.3.5.26

sa yatrāvabhṛthamabhyavaiti | tadetadabhyavaharanti tatsaloma kriyate sa eteṣāmevaikaṃ vāsasām paridhāyodaiti tāni vaśāyai vā vapāyāṃ hutāyāṃ dadyādudavasānīyāyāṃ veṣṭau

And when he enters the bath they throw it into (the water). This is a congruous performance. After putting on one of those same garments he comes out (of the bath). Let him give away those (garments) either when the omentum of the barren cow has been offered, or at the completing oblation.