أَخْبَرَنَا يُوسُفُ بْنُ حَمَّادٍ، قَالَ حَدَّثَنَا عَبْدُ الْوَارِثِ، عَنْ عَبْدِ الْعَزِيزِ، عَنْ أَنَسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَا مِنْ مُسْلِمٍ يُتَوَفَّى لَهُ ثَلاَثَةٌ مِنَ الْوَلَدِ لَمْ يَبْلُغُوا الْحِنْثَ إِلاَّ أَدْخَلَهُ اللَّهُ الْجَنَّةَ بِفَضْلِ رَحْمَتِهِ إِيَّاهُمْ ‏"‏ ‏.‏

It was narrated that Anas said: "The Messenger of Allah said: 'There is no Muslim, three of whose children die before reaching puberty, but Allah will admit him to Paradise by virtue of His mercy towards them."' Translation Not Available

Book Ref: Sunan An Nisai Book 21 Hadith 1873
Web Ref:  Sunan An Nisai Vol 3 Book 21 Hadith 1874