Sunan Ibn Majah, Book 34, Hadith 28 (In-Book) ⓘ
It was narrated from Abu Hurairah that the : Messenger of Allah (saas) said: "No one among you should say: "O Allah, forgive me if You will.' Let him be definite in his asking, and no one can compel Allah."
حَدَّثَنَا أَبُو بَكْرٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، عَنِ ابْنِ عَجْلاَنَ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ يَقُولَنَّ أَحَدُكُمُ اللَّهُمَّ اغْفِرْ لِي إِنْ شِئْتَ وَلْيَعْزِمْ فِي الْمَسْأَلَةِ فَإِنَّ اللَّهَ لاَ مُكْرِهَ لَهُ " .
also referenced under: Hadith 3854 (Reference) & Volume 5, Book 34, Hadith 3854 (DarusSalam)