Shatapatha Brahmana 11.2.7.25

11.2.7.25

sa yadanuyājānto yajñaḥ syāt aśanyantaḥ syāddhrādunyanta utkuṣyantastasmādvai devānāṃ yajña iḍānto vaiva śamyvanto vā

And if the sacrifice were to end with after-offerings, then it would end with the thunderbolt, the hail-stone, and the (heavenly) firebrand: therefore the sacrifice of the gods ends either with the Idâ or with the Samyos.