beha'alosicha

‎​The posuk says ויעש כן אהרן אל מול פני המנורה העלה נרתיה כאשר צוה ה את משה, and Aaron did so toward the face of the menorah, he lit the neiros like 'ה commanded Moshe.
Why does the Torah write an entire posuk to tell us that Aaron did as he was commanded? Would we think otherwise?
When it was time to bring the korban pesach the people that were tamai came to moshe & said למה נגרע לבלתי הקריב, why should we be held back from bringing the korban pesach?
What were they thinking by even asking that? They knew that one couldn't bring the korban in a state of tumah, so what would they gain by even asking? Why wouldn't they just give up on it?
R' Chaim Shmulevits says that from here we see that even when it looks like there is no hope, you can still ask 'ה & He can help. Just like He made a pesach shainie for them because He saw they wanted it so much, if one has strong will then nothing can stand in his way. Even if a person knows that according to his abilities & strengths there is no normal way that he'd succeed, still one should never give up hope. So too says הגרש"ז מקלם, by Aaron, the neiros were the simplest mitzva that he had to do. Any Kohen could have done it; lighting them took almost no effort, whereas an avodah like the ketores, which was done only by Aaron and was done in the Kodesh Hakedoshim, was much more complicated & important. We might think that the neiros would be insignificant to him compared to other more important ones. Yet he did the hatovos hanairos with the same enthusiasm & care as he did the more complicated avodos. That's why the torah had to stress that he did what 'ה commanded. Showing us that we don't know what's considered a big mitzva or a small one. And we don't know what we are supposed to accomplish, whether we think we can or not, teaching us that we have to treat each opportunity to do the mitzvos with the utmost care no matter how impossible, or how small it seems to us!