Al-Adab Al-Mufrad #610
Supplication
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ، قَالَ: أَخْبَرَنَا إِسْمَاعِيلُ ابْنُ عُلَيَّةَ، عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، عَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: إِذَا دَعَا أَحَدُكُمْ فَلْيَعْزِمْ فِي الدُّعَاءِ، وَلاَ يَقُلِ: اللَّهُمَّ إِنْ شِئْتَ فَأَعْطِنِي، فَإِنَّ اللَّهَ لاَ مُسْتَكْرِهَ لَهُ.
Anas reported that the Messenger of Allah, may Allah bless him
and grant him peace, said, "When one of you makes a supplication, he should
be firm in the supplication and not say, 'O Allah, if you like, give to
me.' Allah cannot be forced against His will."
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About Al-Adab Al-Mufrad
This hadith is #610 from Al-Adab Al-Mufrad, in the Book of Supplication.