Someone wrote to Hazrat Amirul Momineen, Khalifatul Masih Vaa and asked, “Is it true that if someone misses a single prayer, their prayers of the last 40 years are wasted?”
Huzooraa, in a letter dated 20 February 2020, gave the following reply:
“[…] The answer to your question about Salat is that if a prayer is missed due to forgetting, then the Holy Prophetsa has said that it should be offered as soon as one remembered the missed prayer. This is the expiation for forgetting to offer a prayer. However, it is a grave sin to intentionally skip a prayer. Its forgiveness can only come from repentance [taubah], seeking forgiveness [istighfar] and a firm resolve and promise not to repeat such a mistake in the future.”