Sahih Muslim Book - 39, Hadith - 5860

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ ، عَنْ هِشَامٍ ، عَنْ مُحَمَّدٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : أَنَّ امْرَأَةً بَغِيًّا رَأَتْ كَلْبًا فِي يَوْمٍ حَارٍّ يُطِيفُ بِبِئْرٍ ، قَدْ أَدْلَعَ لِسَانَهُ مِنَ الْعَطَشِ ، فَنَزَعَتْ لَهُ بِمُوقِهَا فَغُفِرَ لَهَا.

It was narrated from Abu Hurairah from the Prophet (s.a.w): “A prostitute saw a dog on a hot day that was circling a well and its tongue was hanging out because of thirst. She drew some water for it in her shoe, and she was forgiven (by Allah).”