وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ يَقُلْ أَحَدُكُمْ إِذَا دَعَا اللَّهُمَّ اغْفِرْ لِي إِنْ شِئْتَ اللَّهُمَّ ارْحَمْنِي إِنْ شِئْتَ لِيَعْزِمِ الْمَسْأَلَةَ فَإِنَّهُ لاَ مُكْرِهَ لَهُ " .
Yahya related to me from Malik from Abu'z Zinad from al-Arajfrom Abu Hurayra that the Messenger of Allah, may Allah bless him andgrant him peace, said, ''When you are making dua do not say; 'O Allah,forgive me if You wish. O Allah, forgive me if you wish.' You shouldbe firm in your asking, for there is no compelling Him." Translation Not Available
Book Ref: Muwatta Imam Malik Book 15 Hadith 500
Web Ref: Muwatta Imam Malik Book 15 Hadith 28