The Book of Greetings
وَحَدَّثَنِي أَبُو الطَّاهِرِ، أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي جَرِيرُ بْنُ حَازِمٍ، عَنْ أَيُّوبَ السَّخْتِيَانِيِّ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " بَيْنَمَا كَلْبٌ يُطِيفُ بِرَكِيَّةٍ قَدْ كَادَ يَقْتُلُهُ الْعَطَشُ إِذْ رَأَتْهُ بَغِيٌّ مِنْ بَغَايَا بَنِي إِسْرَائِيلَ فَنَزَعَتْ مُوقَهَا فَاسْتَقَتْ لَهُ بِهِ فَسَقَتْهُ إِيَّاهُ فَغُفِرَ لَهَا بِهِ " .Abu Huraira reported Allah's Messenger (ﷺ) as saying:There was a dog moving around a well whom thirst would have killed. Suddenly a prostitute from the prostitutes of Bani Isra'il happened to see it and she drew water in her shoe and made it drink, and she was pardoned because of this
From Sahih Muslim, whose reports the scholars accept as authentic.