An omitted fard cannot simply be remedied with the forgetfulness prostration; the integral must be validly performed. Omission of a wajib has different rules involving sujud al-sahw, depending on circumstances.
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Omitting a Fard Versus a Wajib
Description of Prayer: The Six Obligations
An omitted fard cannot simply be remedied with the forgetfulness prostration; the integral must be validly performed. Omission of a wajib has different rules involving sujud al-sahw, depending on circumstances.