Gobhilagrihyasutra 4.4.22

4.4.22

atha pitṛdevatyeṣu paśuṣu vaha vapāṃ jātavedaḥ pitṛbhya iti vapāṃ juhuyāt,

At animal sacrifices offered to the Fathers let— him sacrifice the omentum with (the verse), 'Carry the omentum, O Gâtavedas, to the Fathers' (MB. II, 3, 16);