Sunan an-Nasa'i 1874

أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ، عَنْ يُونُسَ، عَنِ الْحَسَنِ، عَنْ صَعْصَعَةَ بْنِ مُعَاوِيَةَ، قَالَ لَقِيتُ أَبَا ذَرٍّ قُلْتُ حَدِّثْنِي ‏.‏ قَالَ نَعَمْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ مَا مِنْ مُسْلِمَيْنِ يَمُوتُ بَيْنَهُمَا ثَلاَثَةُ أَوْلاَدٍ لَمْ يَبْلُغُوا الْحِنْثَ إِلاَّ غَفَرَ اللَّهُ لَهُمَا بِفَضْلِ رَحْمَتِهِ إِيَّاهُمْ ‏"‏ ‏.‏

It was narrated that Sa'sa'ah bin Mu'awiyah said:"I met Abu Dharr and said: 'Tell me a Hadith.' He said: the Messenger of Allah said: There are no two Muslims, three of whose children die before reaching puberty, but Allah will forgive them by virtue of His mercy towards them

Reference

Sunan an-Nasa'i 1874

In-book

Book 21, Hadith 57