Musnad Abu Ya'la al-Mawsili 115:24

Shayban narrated to us, Abu Hilal narrated to us, Qatadah narrated to us, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The servant remains in goodness as long as he does not become hasty." They said: "O Messenger of Allah, and how does he become hasty?" He said: "He says: 'I have supplicated, but I do not see that it is being answered for me.'"