Anas bin Malik reported,

The Messenger of Allah ﷺ said, "Allah is more delighted by the repentance of His servant when he turns to Him in Tawba than one of you would be if he were on his mount in a barren desert and it escaped from him, carrying his food and drink, so he despaired of finding it. He came to a tree and lay down in its shade, having given up hope of recovering his mount. While he was in that state, suddenly there it was, standing right beside him. He grabbed its reins and, in the intensity of his joy, exclaimed, 'O Allah, You are my servant and I am Your Lord!' He misspoke from the sheer intensity of his joy."

Muslim 6960

Sahih

حدثنا محمد بن الصباح وزهير بن حرب قالا حدثنا عمر بن يونس حدثنا عكرمة بن عمار حدثنا إسحق بن عبد الله بن أبي طلحة

حدثنا أنس بن مالك وهو عمه قال

قال رسول الله ﷺ لله أشد فرحا بتوبة عبده حين يتوب إليه من أحدكم كان على راحلته بأرض فلاة فانفلتت منه وعليها طعامه وشرابه فأيس منها فأتى شجرة فاضطجع في ظلها قد أيس من راحلته فبينا هو كذلك إذا هو بها قائمة عنده فأخذ بخطامها ثم قال من شدة الفرح اللهم أنت عبدي وأنا ربك أخطأ من شدة الفرح

مسلم 6960صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Tawba
Chapter
Urging repentance and rejoicing in it
Numbering
Darussalam 6960
Muslim 6960