What is the ruling regarding performing the prostration of forgetfulness (Sujud as-Sahw) after forgetting it during prayer and commencing a subsequent prayer?
Chapter on the Two Prostrations of Forgetfulness
Al-Mughni
Book of Prayer
Primary text
If one forgets the prostration of forgetfulness (Sujud as-Sahw) until commencing another prayer, the prostration must be performed after concluding the second prayer, according to the apparent view of al-Kharaqi. This is because the forgotten action is considered intrinsically tied to the original prayer location or structure.
Supporting text
The opinion of others dictates that if the separation (fasl) between the two prayers is prolonged, the forgotten prostration is not performed; however, if the separation is short, it should still be performed.