Satapatha Brahmana Part V (SBE44), Julius Eggeling tr. [1900], at sacred-texts.com
11:1:4:11. Now, some people enter upon the fast 3 when
they (still) see (the moon, on the fourteenth day of the half-month), thinking, 'To-morrow he will not rise,'--either on account of clouds or not having ascertained properly, they enter upon the fast, and (in the morning) he rises over him. Now if he (the moon) should rise on (the material for) the oblation being not yet taken out, then that approved (procedure is followed) and the same fasting-observance. The sour curds from last night's milking they use for coagulating the sacrificial food 1; they let the calves join (their mothers), and drive them away again 2.
11:1:4:22. In the afternoon he drives them away with the parna-branch; and as there that approved oblation of the New-moon offering (is prepared) so here. But if he should not care to undergo (again) the fasting-observance, or if (the moon) were to rise over (the material for) the oblation already taken out, then let him do otherwise: having properly cleansed the rice-grains of the husks, he cooks the smaller ones as a cake on eight potsherds for Agni Dâtri (the Giver).
11:1:4:33. And the sour curds (from the milk) milked on the day before (he prepares) for Indra Pradâtri
[paragraph continues] (the Bestower); and those (larger) rice-grains 1 he cooks in boiled fresh milk as a pap for Vishnu Sipivishta (the Bald); for a pap it is whenever rice-grains are thrown (into milk or sour curds).
11:1:4:44. And as to this being so, it is because that moon is no other than King Soma, the food of the gods;--he (the Sacrificer) at that time sought to secure him 2, and missed him: Agni, the Giver, gives that (moon) to him, and Indra, the Bestower, bestows that one upon him; Indra and Agni give that (moon, Soma) as a sacrifice to him, and that sacrifice given by Indra and Agni he offers. And as to why (he offers) to Vishnu, the Bald, it is because Vishnu is the sacrifice; and as to why to the Bald 3 (sipivishta),--it is that his missing him whom he sought to secure is the bald part (? sipita) of the sacrifice, hence to the Bald one. And on this occasion he should give (to the priests) as much as he is able to give, for no oblation, they say, should be without a dakshinâ. And let him observe the fast just (on the day) when he (the moon) does not rise.
7:3 As, for the Full-moon offering, the Sacrificer should enter on p. 8 the fast at the very time of full moon (I, 6, 3, 34), so, for the New-moon offering, he should do so at the time when the last sign of the moon has disappeared, cf. I, 6, 4, 14.
8:1 Literally, they make it the means of coagulating the havis; that is to say, they put the sour-milk (of last night's milking) into the milk obtained from the milking of this, the second, day so as to produce the sour curds required on the next, or offering-day. See I, 6, 4, 6 seq.;--pûrvedyuh sâyamdugdham payo yad dadhy âtmanâ vidyate parasmin divase punah karanîyasya sâyamdoharûpasya havisha âtañkanârtham kuryuh, Sây.
8:2 See I, 7, 1, 1 seq. The milk of the evening milking will be required for the sour curds and whey to be mixed with the sweet (boiled) milk of the following morning in the preparation of the Sânnâyya.
9:1 According to Katy. Srautas. XXV, 4, 40, the rice-grains are sorted in three different sizes; those of medium size being used for Agni Dâtri, the largest for Indra Pradâtri, and the smallest for Vishnu Sipivishta.
9:2 That is, at the time of new moon when Soma is supposed to stay on earth.
9:3 The native dictionaries also assign the meaning 'affected by a skin-disease' to 'sipivishta.'