Halakhah for Menachot 177:5

The laws of the commandment - for example, that which they said (Sifra, Emor, Section 13:11) [that] the lighting of the lights pushes off Shabbat like the sacrifices, since they have a set time, as it is stated about it, "always"; that (Menachot 89a) half a log of oil was placed in each and every light, as it states, "from evening until morning," and the sages estimated that this is the amount that would suffice for the nights of Tevet (in the winter), and so [too], was it given on all of the nights, and if there would be a surplus, there is nothing [wrong] in that; about the matter of arrangement, [that] it is the cleaning; [that] cleaning the menorah and setting it up is a positive commandment in the morning and in the afternoon; [that] the cleaning is, that [with] each light that became extinguished, he removes the wick and all of the oil that was extinguished, cleans [the bowl] and places another wick and other oil in it, but he [only] fixes a light that has not become extinguished; [that] if the middle (eastern) light becomes extinguished, he lights it from fire that is in the outer altar, but the others he lights one from another by pulling the wick and inclining it until it catches on fire, since it is not [fit] the honor of the commandment to light it from another light; and the rest of its details - are [all] elucidated in the eighth chapter of Menachot and in places in Tamid.