Anas (May Allah be pleased with him) reported:
The Messenger of Allah ﷺ said, "Any Muslim who loses three children before they reach the age of maturity, will be granted Jannah by Allah, the Exalted, out of His Mercy for them."

[Al-Bukhari and Muslim].

عن أنس رضي الله عنه قال: قال رسول الله ﷺ : "ما من مسلم يموت له ثلاثة لم يبلغوا الحنث إلا ادخله الله الجنة بفضل رحمته إياهم" ((متفق عليه)).