As-salamu ?alaykum brothers and sisters,

My question is regarding the following comment I have seen on YouTube video regarding the story of Musab Ibn Umair (radi Allahu 'anhu).

''...he said the ayat that rasoolullah (pbuh) recited upon the body of musab ibn umair (RA) is from surah ahzab. but the companion was martyred at uhud. sura ahzab was revealed days after uhud during the battle of ahzab. can any brother clarify the fact if I'm mistaken or not? ofcourse I'm no scholar but I'd like to know if there's any mistake in my knowledge. Allah knows best. thankyou ''