عن أبي هريرة رضي الله عنه
أن رسول الله صلى الله عليه وسلم قال: «لا يقولن أحدكم: اللهم اغفر لي إن شئت: اللهم ارحمني إن شئت، ليعزم المسألة، فإنه لا مكره له» وفي رواية لمسلم: «ولكن ليعزم، وليعظم الرغبة، فإن الله تعالى، لا يتعاظمه شيء أعطاه»
The Messenger of Allah (sallallahu alayhi wa sallam) said, “You must not supplicate: ‘O Allah! forgive me if You wish; O Allah bestow mercy on me if You wish.’ But beg from Allah with certitude for no one has the power to compel Allah.”Another narration of Muslim is: “A supplication should be made in full confidence and one should persistently express his desire (before Allah) in his supplication, for no bounty is too great for Allah to bestow (upon his slaves).”
Riyad as-Salihin 1743, Book 18, The Book of the Prohibited actions, Hadith 233. 1 min read