Section 1 Mishkat al-Masabih 2226
Arabic hadith text
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:" إِذَا دَعَا أَحَدُكُمْ فَلَا يَقُلِ: اللَّهُمَّ اغْفِرْ لِي إِنْ شِئْتَ وَلَكِنْ لِيَعْزِمْ وَلْيُعَظِّمِ الرَّغْبَةَ فَإِنَّ اللَّهَ لَا يَتَعَاظَمُهُ شيءٌ أعطاهُ ". رَوَاهُ مُسلم
Translation
He reported God’s messenger as saying, “When one of you makes supplication he must not say, ‘O God, forgive me if Thou wilt, but must be definite and cherish a great desire, for nothing which God gives is burdensome to Him.” Muslim transmitted it.