YV 1.6f

Therefore in the middle men enjoy strength. The part of man above the navel is pure, that below is impure. In that he girds him in the middle he discriminates between the pure and impure parts. Indra hurled his thunderbolt against Vrtra; it divided into three parts; one-third the wooden sword, one-third the chariot, and one-third the sacrificial post [4]. The internal arrows which were split (açiryanta) became Çara grass, and that is why Çara grass is so called. The thunderbolt is Çara grass; hunger indeed is the foe of man. In that the girdle is of Çara grass, he clearly drives away the enemy hunger from the middle (of man's body). It is threefold. The breath is threefold; verily he places the threefold breath in the middle of the sacrificer. It is broad, for the discrimination of the strands. He consecrates the sacrificer with a girdle, with a yoke his wife, for the sake of offspring [5]. The sacrifice reflected on the gift (to the priests). He had intercourse with her. Indra perceived this and reflected, 'He who will be born from this union will be this world.' He entered her; from her verily was Indra born; he reflected, 'He who hence other than I will be born will be this world'. Stroking her womb he split it, she became barren after birth, and that is the origin of the (cow) which is barren after birth [6]. He wrapped it (the yoni) in his hand, he deposited it among the wild beasts, it became the horn of the black antelope. 'Thou art the birthplace of Indra; harm me not', (with these words) he hands the horn of the black antelope. Verily he makes the sacrifice united with the womb, the gift with the womb, Indra with the womb, for union with the womb. 'For ploughing thee, for good crops', he says. Therefore plants grow up without ploughing. 'For those of good fruits thee, for the plants', he says. Therefore plants bear fruit. If he were to scratch himself with his hand [7] his offspring would be liable to the itch; if he were to smile, they would become naked.