Mbh 13.134.1

"'"Skanda said, 'I shall now declare a duty that is approved of by me. Do ye listen to it with concentrated attention. That person who takes a little earth from the horns of a bull of blue complexion, smears his body therewith for three days, and then performs his ablutions, acquires great merits. Hear what those merits are. By such an act he would wash away every stain and evil, and attain to sovereign sway hereafter. As many times he takes his birth in this world, so many times does he become celebrated for his heroism. Listen now to another mystery unknown to all. Taking a vessel of copper and placing therein some cooked food after having mixed it with honey, one should offer it as Vali unto the rising moon on the evening of the day when that luminary is at full. Do ye learn, with faith, what the merits are of the person that acts in this way. The Sadhyas, the Rudras, the Adityas, the Viswedevas, the twin Aswins, the Maruts, and the Vasus, all accept that offering. By such an offering Soma increases as also the ocean, that vast receptacle of waters. This duty that is declared by me and that is unknown to all, if performed, is certainly fraught with great happiness.'