Midrasch zu Jeschijahu 40:15

Similarly, when He said: Command the children of Israel, and say unto them: My food which is presented unto Me for offerings (Num. 28:2), Moses called out: Master of the Universe, if I should assemble all the animals and all the beasts in the world, they would not be sufficient for even one offering, and all of the trees in the world would be insufficient for a single fire, for it is said: And Lebanon is not sufficient fuel, nor the beasts thereof sufficient for burial offerings (Isa. 40:16). He replied: Moses, it is not as you think. You need offer unto Me but one lamb in the morning and not two, for they are not meant to be food and drink for Me. If I had food and drink when you were with Me on the mountain for forty days, would I not have eaten, and if I had food would you not have eaten? Only for a sweet savor, shall ye observe to offer unto Me (Num. 28:2).