Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 1.4.9

1.4.9

tathā ha asya prayāja anuyājebhyo anitam.(?).bhavati /

i. 4. With discriminations he offers the fore-offerings and the after-offerings; the fore-offerings and the after-offerings are the seasons; thus does he gather him from the seasons. The discriminations are the head words of these Ṛcs, 'O Agni, come for enjoyment'; 'Agni we choose as messenger'; 'By Agni Agni is kindled'; 'May Agni smite the foes'; 'Of Agni the praise we meditate'; 'To Agni that mortal who doth service.' They are six; the seasons are six; verily from the seasons for a second time he gathers him. The last fore-offering and after-offering are unaltered. Thus he does not depart from the fore-offerings and the after-offerings. The first butter-portion is connected with the slaying of Vṛtra; verily (it serves) for the destroying of the evil one. Thus he does not depart from the model of the full-moon sacrifice. 'He should make the first (butter-portion) for Agni, the wise, (saying) "Agni do ye awaken with the praise",' some say, 'the