Narrated Abu Umamah bin Sahl (RA):

'Umar (RA) wrote to Abu Ubaidah (RA) that Allah's Messenger (ﷺ) had said: "Allah and His Messenger are the Patrons of him who has none and a maternal uncle is the heir of him who has no inheritor." [Reported by Ahmad and al-Arba'a except Abu Dawud. at-Tirmidhi graded it Hasan (good); Ibn Hibban graded it Sahih (authentic)].

وَعَنْ أَبِي أُمَامَةَ بْنِ سَهْلٍ قَالَ : { كَتَبَ مَعِي عُمَرُ إِلَى أَبِي عُبَيْدَةَ ‏- رَضِيَ اَللَّهُ عَنْهُمْ‏- ; أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَ : " اَللَّهُ وَرَسُولُهُ مَوْلَى مَنْ لَا مَوْلَى لَهُ , وَالْخَالُ وَارِثُ مَنْ لَا وَارِثَ لَهُ } رَوَاهُ أَحْمَدُ , وَالْأَرْبَعَةُ سِوَى أَبِي دَاوُدَ , وَحَسَّنَهُ اَلتِّرْمِذِيُّ , وَصَحَّحَهُ اِبْنُ حِبَّانَ [1]‏ .‏