Or HaChaim on Numbers 17:3/אור החיים על במדבר י״ז:ג׳

1 החטאים האלה בנפשתם, "of these sinners who sinned at the cost of their souls." The reason the Torah repeats this may have been so that Aaron and Moses would not feel badly at having been involved in causing the deaths of these people. The Israelites should also not attribute the death of Korach and associates to any fault on the part of Moses or Aaron. The Torah therefore emphasises that not Moses and Aaron but solely these sinners themselves were to blame for what happened to them. In spite of all this, the Israelites did not understand G'd's intention and accused Moses and Aaron of being the cause of the death of these people (17,6).

2כי הקריבום לפני ה׳ ויקדשו, "because they were offered before the Lord and have become sanctified." G'd explains that if He ordered these censers to be turned into a cover for the altar this did not mean that He was pleased with the incense that had been offered in them; on the contrary, the incense was repugnant to Him. However, the fact that these censers had been used for a holy purpose made them holy themselves. The new dimension of all this is that these censers were considered holy before the wrong people offered incense in them as they had been constructed for a holy purpose. ויקדשו, "they have become sanctified;" when someone donates silver or golden trinkets for the Temple, these trinkets become sanctified. Consider the status of these censers if the associates of Korach had decided at the last moment not to go through with their challenge to offer incense in them. The censers would have remained holy although they had not been used for the purpose for which they had been designated. As to the argument of Nachmanides against Rashi that the status of these censers was similar to vessels a non-priest constructed in order to offer a sacrifice outside the precincts of the Temple [and which therefore are not holy, Ed.], the Torah writes: "they have been offered before the Lord and become sanctified" (i.e. inside the precincts of the Tabernacle). The situation is not comparable to the one described by Nachmanides then as these censers had been brought to a site which was sanctified.