Prayer: If I Discover Years Later That My Worship Was Invalid or Doubt Its Correctness, What Must I Do?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: If I Discover Years Later That My Worship Was Invalid or Doubt Its Correctness, What Must I Do?

English:

Question #517:

What is the religious duty of a person who realises after a number of years that his worship was invalid, or doubts its correctness?

Answer #517:

Doubts after the performance of a deed are ignored. In case he is certain of its invalidity, he must perform the qaḍā’ of what is possible.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer