بُلُوغُ الْمَرَامِ
Bulugh al-Maram 941
Business Transactions
وَعَنْهُ قَالَ : قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ مَنْ آوَى ضَالَّةً فَهُوَ ضَالٌّ , مَا لَمْ يُعَرِّفْهَا } رَوَاهُ مُسْلِم ٌ [1] .
Narrated [Zaid bin Khalid (RA)]: Allah's Messenger (ﷺ) said: "He who shelters a stray (animal) is astray himself if he does not make it known." [Reported by Muslim].
Sunnah.com reference: Book 7, Hadith 202