When do we prostrate for forgetfulness? I mean, what are the causes of the prostration for forgetfulness?

Question:
When do we prostrate for forgetfulness? I mean, what are the causes of the prostration for forgetfulness?

Answer:
The prostration for forgetfulness is obligatory in general terms. Yes. Any addition to the prayer, or any omission from it. An addition to the prayer that is not of its kind, such as adding a unit of prayer, or adding a bowing or a prostration. Or an omission from the prayer, such as leaving out the first tashahhud, for example, or leaving out saying "Our Lord, forgive us" between the two prostrations, or leaving out the takbir for moving from one position to another; this is an omission. The third case is the case of doubt: if one doubts about a pillar, if he doubts about performing a pillar or an obligatory act, he treats it as if it were left out, he performs its substitute, and he prostrates for forgetfulness. Yes. May Allah reward you with good, and may He do you well.