The Prophet (ﷺ) said, "None of you should say: 'O Allah! Forgive me if You wish,' or 'Bestow Your Mercy on me if You wish,' or 'Provide me with means of subsistence if You wish,' but he should be firm in his request, for Allah does what He will and nobody can force Him (to do anything).
Sahih al-Bukhari Book 97, Hadith 103
← Previous Hadith Whenever a beggar or a person in need of something came to the Prophet (ﷺ) , he used to say (to his companions), "Intercede (for him) and you will be rewarded for that, and Allah will fulfill what He will through His Apostle's tongue."

Sahih al-Bukhari Book 97, Hadith 102 Next Hadith → That he differed with Al-Hurr bin Qais bin Hisn Al-Fazari about the companion of Moses, (i.e., whether he was Kha,dir or not). Ubai bin Ka`b Al-Ansari passed by them and Ibn `Abbas called him saying, 'My friend (Hur) and I have differed about Moses' Companion whom Moses asked the way to meet. Did you hear Allah's Messenger (ﷺ) mentioning anything about him?" Ubai said, "Yes, I heard Allah's Apostle saying, "While Moses was sitting in the company of some Israelites a man came to him and asked, 'Do you know Someone who is more learned than you (Moses)?' Moses said, 'No.' So Allah sent the Divine inspiration to Moses:-- 'Yes, Our Slave Khadir is more learned than you' Moses asked Allah how to meet him ( Khadir) So Allah made the fish as a sign for him and it was said to him, 'When you lose the fish, go back (to the place where you lose it) and you will meet him.' So Moses went on looking for the sign of the fish in the sea. The boy servant of Moses (who was accompanying him) said to him, 'Do you remember (what happened) when we betook ourselves to the rock? I did indeed forget to tell you (about) the fish. None but Satan made me forget to tell you about it' (18.63) Moses said: 'That is what we have been seeking." Sa they went back retracing their footsteps. (18.64). So they both found Kadir (there) and then happened what Allah mentioned about them (in the Qur'an)!' (See 18.60- 82)

Sahih al-Bukhari Book 97, Hadith 104