YV 5.2j

They grasped him about, and illness seized him. 'Illness has seized the king'; that (saying) is the origin of the 'king's evil '. In that he became worse, that is (the origin) of the 'bad illness'; because he got it from his wives, that is (the origin) of the 'wife's disease' (Jayenya), him who knows thus the origin of these illnesses, these illnesses do not visit. He ran up to these two in reverence; they said, 'Let us choose a boon; let us be the appointers of portions for the gods [5]; from us let the gods be sacrificed to.' Therefore of the series of nights it is on the new and the full moon night that the gods are sacrificed to; for they are the appointers of portions for the gods. Men appoint portions to him who knows thus. Creatures slew hunger, man at once, the gods at the half-month, the Pitrs in a month, trees in a year. Therefore day by day men desire food, at the half-month the gods are sacrificed to, every month offering is made to the Pitrs, in a year trees produce fruit. He who knows thus slays the enemy, hunger. The Part of the Hotr at the New and Full Moon Sacrifices The gods could not rest on the Rc or the Yajus. On the Saman only could they rest. He makes the noise 'Him'; verily he makes the Saman. He makes the noise 'Him'; where the gods rested, there he sets them in motion. He makes the noise 'Him'; this is the yoking of speech. He makes the noise 'Him'; thus the sacrificers produce offspring. He repeats the first (verse) thrice, the last thrice; verily he ties the end of the sacrifice [1] so that it may not slip. He repeats (it) continuously, for the continuity of the breaths and of food, and for the smiting away of the Raksases. The first he repeats is connected with the Rathantara (Saman), this world is connected with the Rathantara; verily he conquers this world. He divides it thrice; these worlds are three; verily he conquers these worlds.