The Qur'an
Malik :: Book 15 : Hadith 15.8.26
Yahya related to me from Malik from Abu'z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "Every prophet is given a supplication (dua), and I wish to preserve my dua as intercession for my community in the next world.