(3) باب الْعَزْمِ بِالدُّعَاءِ وَلاَ يَقُلْ إِنْ شِئْتَ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
When one of you makes a supplication (to his Lord) one should not say: O Allah, grant me pardon, if Thou so likest, but one should beg one's (Lord) with a will and full devotion, for there is nothing so great in the eye of Allah which He cannot grant.
Reference: Sahih Muslim 2679 a
In-book reference: Book 48, Hadith 8
USC-MSA web (English) reference(deprecated numbering scheme): Book 35, Hadith 6478