Sahih Muslim Book 4, Hadith Number 1430.

Chapter : Who deserves most to act as Imam.

Abu Salama reported it on the authority of Abu Huraira that the Apostle of Allah (may peace be upon him) recited Qunut after ruku’ in prayer for one mouth at the time of reciting (these words): “Allah listened to him who praised Him,” and he said in Qunut: “O Allah! rescue al-Walid b. al-Walid; O Allah! rescue Salama b. Hisham; O Allah! rescue ‘Ayyash b. Abu Rabi’a; O Allah! rescue the helpless amongst the Muslims; O Allah! trample Mudar severely; O Allah! cause them a famine like that (which was caused at the time) of Joseph.” Abu Huraira (further) said: I saw that the Messenger of Allah (may peace be upon him) afterwards abandoned this supplication. I, therefore said: I see the Messenger of Allah (may peace be upon him) abandoning this blessing upon them. It was raid to him (Abu Huraira): Don’t you see that (those for whom was blessing invoked by the Holy Prophet) have come (i.e. they have been rescued)?