She poured water for Abu Qatadah to perform ablution. A cat came and drank the water, and he tilted the vessel for it. She started looking at it (in surprise) and he said: "O daughter of my brother, do you find it strange? The Messenger of Allah said: 'They (cats) are not impure, they are of those who go around among you.'"  

وَكَانَتْ تَحْتَ بَعْضِ وَلَدِ أَبِي قَتَادَةَ أَنَّهَا صَبَّتْ لأَبِي قَتَادَةَ مَاءً يَتَوَضَّأُ بِهِ فَجَاءَتْ هِرَّةٌ تَشْرَبُ فَأَصْغَى لَهَا الإِنَاءَ فَجَعَلْتُ أَنْظُرُ إِلَيْهِ فَقَالَ يَا ابْنَةَ أَخِي أَتَعْجَبِينَ قَالَ رَسُولُ اللَّهِ ﷺ إِنَّهَا لَيْسَتْ بِنَجَسٍ هِيَ مِنَ الطَّوَّافِينَ أَوِ الطَّوَّافَاتِ  

"The Messenger of Allah and I used to perform ablution from a single vessel, when the cat had drunk from it beforehand."  

كُنْتُ أَتَوَضَّأُ أَنَا وَرَسُولُ اللَّهِ ﷺ مِنْ إِنَاءٍ وَاحِدٍ قَدْ أَصَابَتْ مِنْهُ الْهِرَّةُ قَبْلَ ذَلِكَ  

The Messenger of Allah said: "Cats do not invalidate the prayer, because they are one of the things that are useful in the house."  

قَالَ رَسُولُ اللَّهِ ﷺ الْهِرَّةُ لاَ تَقْطَعُ الصَّلاَةَ لأَنَّهَا مِنْ مَتَاعِ الْبَيْتِ