Qur'an

Receiving the rewards of reciting Quraan if one cannot recite with tajweed

Q: Without knowing the recitation of Quran with tajweed, many people recite surahs that are mentioned in the hadeeth with great rewards (fazeelat) for example, surah Mulk, surah Kahf, surah Waqiah etc.Will they get the rewards as mentioned in the hadeeth or will they get sin? Secondly, should they recite these surahs mentioned in the hadeeth on regular basis.

Altering the Quraan

Q: I know that the Quran has never been changed. Did it happen in the history that someone tried to change/add words to the Quran? I know for sure if someone did it, they would fail miserably and it would be discovered because Allah protects the Quran. Just asking if someone actually attempted to change it.

Clarification regarding an incident of Hazrat Moosa (alaihis salaam) and Hazrat Haaroon (alaihis salaam)

Q: I'm clarifying a question. I was listening to a dars which was telling about a conversation between Hazrat Musa (alaihis salaam) and Hazrat Haroon (alaihis salaam). I couldn't listen to the whole dars but I heard a sentence that the narrator was saying that Musa (alaihis salaam) said to Haroon (alaihis salaam) that 'You were a better Khalifa than me, why didn't you guide people in my absence?'. Is this waqia mentioned in the Quran?