As Salaamu Alaikum Mufti.
My friends and I were having a discussion regarding Qadha Salaah. One of the people was of the opinion that it is sufficient to make sincere taubah and that is that with regards to missed salaah. I on the other hand, will always believe that all missed salaah must be repaid via Qadha Salaah. But the whole issue got me thinking that I was taught this and I was not told of any specific Hadith or ayah from the Quran. So, in the interest of self improvement, can you point me to the relevant Quranic Ayahs and/or hadith that relate to Qadha Salaah. And if possible provide some insight into the various schools of thought regarding missed salaah.