Aitareyabrahmana 4.5.p2

4.5.p2

iv. 29 (xx. 1). Agni as deity bears the first day, the Trivṛt Stoma, the Rathantara Sāman, the Gāyatrī metre. With it according to the deity, the Stoma, the Sāman, the metre, he prospers who knows thus. That which has (the words) 'hither' and 'forward' is a symbol of the first day. That which contains (the word) 'yoke', (the word) 'car', (the word) 'swift', (the word) 'drink', (the fact) that the deity is mentioned in the first Pada, that this world is referred to, that which is connected with the Rathantara, which is connected with the Gāyatrī, the future tense, these are the symbols of the first day. 'Advancing forward up to the sacrifice' is the Ājya of the first day; (the word) 'forward' on the first day is a symbol of the first day. 'O Vāyu, come hither, O lovely one' is the Praüga; (the word) 'hither'