Muwatta Malik, Book 15, Hadith 498 (In-Book)

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.

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ لِكُلِّ نَبِيٍّ دَعْوَةٌ يَدْعُو بِهَا فَأُرِيدُ أَنْ أَخْتَبِئَ دَعْوَتِي شَفَاعَةً لأُمَّتِي فِي الآخِرَةِ ‏" ‏ ‏.‏

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also referenced under: Book 15, Hadith 26 (USC-MSA)