Very weak
graded by Al-Albani
Mishkat al-Masabih 488
Narrator:Abu Sa‘īd al-Khudri
وَعَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ سُئِلَ عَنِ الْحِيَاضِ الَّتِي بَيْنَ مَكَّةَ وَالْمَدِينَةِ تَرِدُهَا السبَاع وَالْكلاب والحمر وَعَن الطُّهْرِ مِنْهَا فَقَالَ: " لَهَا مَا حَمَلَتْ فِي بُطُونِهَا وَلَنَا مَا غَبَرَ طَهُورٌ. رَوَاهُ ابْنُ مَاجَه
Abu Sa'id al-Khudri said that God's messenger was asked about the purity of the cisterns between Mecca and Medina to which beasts of prey, dogs and asses go down, and replied, “They have what they carry in their bellies, and we have what is left as pure water.” Ibn Majah transmitted it.
Reported by Ibn Majah (No. 519). Cited in Mishkat al-Masabih (No. 488).