Sahih al-Bukhari 6338
Book 80: Invocations · Narrated by Anas
Arabic
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا إِسْمَاعِيلُ، أَخْبَرَنَا عَبْدُ الْعَزِيزِ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا دَعَا أَحَدُكُمْ فَلْيَعْزِمِ الْمَسْأَلَةَ، وَلاَ يَقُولَنَّ اللَّهُمَّ إِنْ شِئْتَ فَأَعْطِنِي. فَإِنَّهُ لاَ مُسْتَكْرِهَ لَهُ ".
English translation
Narrated Anas:Allah's Messenger (ﷺ) said, "When anyone of you appeal to Allah for something, he should ask with determination and should not say, 'O Allah, if You wish, give me.', for nobody can force Allah to do something against His Will
Reference: Sahih al-Bukhari 6338, Book of Invocations. English translation by Dr. Muhammad Muhsin Khan.