Shatapatha Brahmana 9.5.1.23

9.5.1.23

ta upavasathe 'gnīṣomīyam paśumālebhire | tadu hāsurā anveva bubudhire tasya samiṣṭayajūṃṣyahutānyāsurathājagmustasmāttasya paśoḥ samiṣṭayajūṃṣi na juhvati te devā asurānpra

On the day of preparation they slaughtered the Agnîshomîya victim. But the Asuras became aware of this also. The Samishtayagus oblations of this (offering) had not yet been offered, when they arrived; whence people offer no Samishtayagus for this animal(-offering). The gods, espying the Asuras, snatched up the sacrifice, and began doing something else. They went away again, thinking, 'It is something else they are doing.'