Kaushitakagrihyasutra 1.14.11

1.14.11

athāsyā udaramabhimṛśet suparṇo 'si garutmān trivṛtte śiro gāyatraṃ cakṣuśchandāṃsyaṅgāni yajūṃṣi nāma sāma te tanūḥ vāmadevyaṃ madhyaṃ bṛhadrathantare pakṣau yajñāyajñiyaṃ pucchaṃ dhiṣṇyaṃ śaphāḥ \ modamānīṃ gāpayenmahāhaimavatīṃ vā \11\

Then he touches her belly with: ‘You are the winged bird Garutmat; the trivṛt [stoma] is your head, the Gāyatrī your eye, the metres your limbs, the Yajus formulas your name, the Sāman your body, the Vāmadevya your middle, the Bṛhat and Rathantara your two wings, the Yajñāyajñiya your tail, the hearths your hooves.’ He should cause them to sing the Modamānī or the Mahāhaimavatī chant.