Sunan Ibn Majah
1605
Sahih+3

It was narrated from Anas bin Malik that the Prophet (ﷺ) said:“There are no two Muslims (mother and father), three of whose children die before reaching the age of puberty, but Allah will admit them to Paradise by virtue of His mercy towards them.”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi