Commentary for Leviticus 8:36

ויעש אהרן ובניו SO AARON AND HIS SONS DID [ALL THE THINGS] — This is stated to tell their praise — that they did not turn to the right nor to the left (cf. Sifra, Tzav, Mechilta d'Miluim 1 38).

AND AARON AND HIS SONS DID ALL THE THINGS WHICH THE ETERNAL COMMANDED BY THE HAND OF MOSES. Everywhere in this section it says ‘as’ the Eternal commanded Moses,²³¹Above, Verses 13, 17, 21, 29. The Hebrew text here reads: “as the Eternal commanded ‘by the hand of’ Moses.” But this expression I did not find in the Five Books of Moses, but in the Book of Joshua (14:2, etc.). And Ramban’s aim is clearly to distinguish everything that Moses did, which was exactly “as” G-d had commanded him, from that which the sons of Aaron did, as explained in the text. Hence it would seem to be correct that the reading in the text should be “as the Eternal commanded Moses.” It is so also in the Tur who quotes the language of Ramban. but here, since Aaron’s sons added to the command [by bringing strange fire which He had not commanded them],²³²Further, 10:1. He does not say it in this way, since they did not do as the Eternal commanded Moses. Rather, the verse states that they did all the things ‘which’ the Eternal commanded, and they further added to them “the strange fire” of which He said that He had not commanded them.²³²Further, 10:1.
Shemini

את כל הדברים אשר צוה ה' ביד משה, “all the matters which Hashem had commanded through Moses. Nachmanides writes that the reason the Torah does not use the customary wording of כאשר צוה ה' את משה, is because Aaron’s sons did not do exactly as G’d had commanded Moses, by adding strange fire, i.e. fire that did not originate in heaven. They had not been instructed to do this.