Al-Adab Al-Mufrad #661
Supplication
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا مُسَدَّدٌ، قَالَ: حَدَّثَنَا عَبْدُ الْوَارِثِ، عَنْ عَبْدِ الْعَزِيزِ، عَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: إِذَا دَعَوْتُمُ اللَّهَ فَاعْزِمُوا فِي الدُّعَاءِ، وَلاَ يَقُولَنَّ أَحَدُكُمْ: 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 you call on Allah, be definite in your
supplication. None of you should say, 'If You will, give it to me.' No
one can force Allah."
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About Al-Adab Al-Mufrad
This hadith is #661 from Al-Adab Al-Mufrad, in the Book of Supplication.