If one performs an act of worship and makes a mistake in it out of ignorance, is there an expiation for that?

Question:
May Allah reward you with good, and may He do you good. If one performs an act of worship and makes a mistake in it out of ignorance, is there an expiation for that?

Answer:
If there is any defect in it, it is not valid. If he leaves out any of its conditions, or any of the obligatory acts of the worship, or leaves out any of its pillars, then it is not valid. Rather, he must repeat it correctly, unless the defects are numerous and the period is long. In that case, he should start fresh by completing the worship and performing it in the correct manner, and Allah forgives what has passed. The man who used to pray poorly, when he came to the Prophet (peace and blessings be upon him) and he saw him praying poorly, taught him (peace and blessings be upon him) how to pray and pointed out to him what he was neglecting, but he did not order him to repeat what had already passed. So if this shortcoming stems from ignorance, the period is long, and the acts of worship with defects are numerous, he should start fresh with determination and caution, and Allah forgives what has passed. However, if the acts of worship are few and he can make them up and perform them, then he must make them up. Yes.