"the one lamb, etc." Why is this written? (It seems superfluous.) Because it is written (3) "And you shall say to them: This is the fire-offering, etc." and (Shemot 29:38) "And this is what you shall offer upon the altar," I might think that he should sacrifice four. It is, therefore, written "the one lamb" — not more than one.
(Bamidbar 28:5) "and a tenth of an ephah": one of ten in an ephah. "flour": of wheat. You say this, but perhaps it may be of barley, spelt, oats or shifon (a kind of spelt). It is, therefore, written (Shemot 29:2) "Of wheat flour shall you make them." Since "flours" are mentioned in the Torah unqualified, and in one instance it is specified that it must be wheat flour, so, all "flours" in the Torah are to be only of wheat. (Bamidbar 28:5) "for the meal-offering mixed with oil of crushing": to exclude (oil that is exuded from) what is cooked. This tells me only of (oil that is kasher for) meal-offerings. Whence do I derive (the same for) the menorah? It is written (in that regard) (Vayikra 24:2) "Command the children of Israel that they take to you clear oil of beaten olives" — to exclude what is cooked.