عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ قَالَ إِذَا دَعَا أَحَدُكُمْ فَلَا يَقُولَنَّ اللَّهُمَّ إِنْ شِئْتَ وَلَكِنْ لِيُعْظِمْ رَغْبَتَهُ فَإِنَّ اللَّهَ عَزَّ وَجَلَّ لَا يَتَعَاظَمُ عَلَيْهِ شَيْءٌ أَعْطَاهُ
Narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, said: When any person makes supplication, he should not say: O Allah! If You will, then do such and such; rather, he should emphasize his desire (and supplicate with insistence), for nothing is difficult or great for Allah Almighty.