Sahih Muslim 2747 a
Anas b. Malik reported that Allah's Messenger (ﷺ) said:
Allah is more pleased with the repentance of a servant as he turns towards Him for repentance than this that one amongst you is upon the camel in a waterless desert and there is upon (that camel) his provision of food and drink also and it is lost by him, and he having lost all hope (to get tbat) lies down in the shadow and is disappointed about his camel and there he finds that camel standing before him. He takes hold of his nosestring and then out of boundless joy says: 0 Lord, Thou art my servant and I am Thine Lord. He commits this mistake out of extreme delight.
حَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا عُمَرُ بْنُ يُونُسَ، حَدَّثَنَا 
 عِكْرِمَةُ بْنُ عَمَّارٍ، حَدَّثَنَا إِسْحَاقُ بْنُ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ، حَدَّثَنَا أَنَسُ بْنُ مَالِكٍ، - وَهُوَ
 عَمُّهُ - قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ لَلَّهُ أَشَدُّ فَرَحًا بِتَوْبَةِ عَبْدِهِ حِينَ يَتُوبُ
 إِلَيْهِ مِنْ أَحَدِكُمْ كَانَ عَلَى رَاحِلَتِهِ بِأَرْضِ فَلاَةٍ فَانْفَلَتَتْ مِنْهُ وَعَلَيْهَا طَعَامُهُ وَشَرَابُهُ فَأَيِسَ
 مِنْهَا فَأَتَى شَجَرَةً فَاضْطَجَعَ فِي ظِلِّهَا قَدْ أَيِسَ مِنْ رَاحِلَتِهِ فَبَيْنَا هُوَ كَذَلِكَ إِذَا هُوَ بِهَا
 قَائِمَةً عِنْدَهُ فَأَخَذَ بِخِطَامِهَا ثُمَّ قَالَ مِنْ شِدَّةِ الْفَرَحِ اللَّهُمَّ أَنْتَ عَبْدِي وَأَنَا رَبُّكَ ‏.‏ أَخْطَأَ
 مِنْ شِدَّةِ الْفَرَحِ ‏"‏ ‏.‏