The (Sunni)daleel for Qunut in the prayers

Among the 4 madahaib(and wahhabi sect)there is a difference on The Prophet(SAAW)praying Qunut in every salah. It is quite evident that this is a strong sunna in fiqh.We wont state the wahhabi opinion(because nobody cares!)However As-Shafi'i held it was obligatory in the fajr prayers.The Ahnaaf hold it only mu'akkadah in the witr salah. But we will look at the text of Ibn Abi Zayd in maliki school where he holds it fardh!

   In the Risalah it states:

"10.1t. The Qunut

except that  you also recite the qunut after doing ruku' 
although you can, if you want, recite it before ruku' after finishing your 
recitation of Our'an. 

[ The Qunut is done in the second rak'at after coming up from ruku', although it 
could be before the ruku', there being a disagreement about whether it is 
meritorious or sunna. If it is sunna and he omits it and he does not prostrate for it, 
his prayer is is invalid. If it is meritorious and he prostrates for it, his prayer is 
invalid if the prostration is before the salam. It appears from the words of the 
author that it is better after ruku'. It is the position of Ibn Habib. The well-known 
position is that it is better before ruku' based on what is in the Sahih that the 
Prophet was asked whether it was before or after and he replied that it was 
before. It is also based on kindness to the one who is preceded and because that 
is what 'Umar continued to do in the presence of the Companions. 

The well-known position is that he does not raise his hands as he does not raise 
them in saying "Amen" or in the supplication of the tashahhud. It is better to do it 
silently because it is a supplication. If he forgets to do it before ruku', he can do it 
after it if he remembers. He cannot go back from ruku' if he remembers. If he 
does go back, then his prayer is invalid because he went back from an obligation 
to something recommended."

For those who claim shi'a make bid'a in the salah,this is a clear proof for it's validity.Also books like "Al-Bulug Al-Maram"where it's evident the qunut was recited other than witr & fajr prayers.As for us a great daleel for this practice can be found here from al-islam.org!