Sunan an-Nasa'i 1876
سنن النسائي#1876SahihIt was narrated from Abu Hurairah that the Prophet said:"There are no two Muslims, three of whose children die before reaching puberty, but Allah will admit them to Paradise by virtue of His mercy toward them. It will be said to them: 'Enter Paradise.' They will say: 'Not until our parents enter.' So it will be said: 'Enter Paradise, you and your parents
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 21:59