Sunnah.com reference : Book 7, Hadith 202English translation : Book 7, Hadith 948Arabic reference : Book 7, Hadith 941
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].
وَعَنْهُ قَالَ : قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ مَنْ آوَى ضَالَّةً فَهُوَ ضَالٌّ , مَا لَمْ يُعَرِّفْهَا }  رَوَاهُ مُسْلِم ٌ  1‏ .‏‏1 ‏- صحيح .‏ رواه مسلم ( 1725 )‏.‏