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]. (DE)
App reference (DE): Book 7, Hadith 58 (DE)
Arabic/English book reference (DE): Book 7, Hadith 952 (DE)