And they who believe and whose seed follow them in faith, We cause their seed to join them (there), and We deprive them of nought of their (life’s) work. Every man is a pledge for that which he hath earned.  [Quran 52:21]

Tafsir Ibn Kathir:

In this Ayah, Allah the Exalted affirms His favor, generosity, graciousness, compassion and beneficence towards His creation. When the offspring of the righteous believers imitate their parents regarding faith, Allah will elevate the latter to the ranks of the former, even though the latter did not perform deeds as goodly as their parents. Allah will comfort the eyes of the parents by seeing their offspring elevated to their grades. Surely, Allah will gather them together in the best manner, and He will not decrease the reward or the grades of those higher in rank for joining them together, hence His statement,