What is the ruling if a person praying sitting performs one prostration while signaling (with a gesture) for the second prostration, despite being capable of actual prostration, being ignorant of the prohibition, and then realizes this error before concluding the prayer?
Chapter on the Times When Prayer is Prohibited
Al-Mughni
Book of Prayer
Primary text
If one performs one prostration while signaling for the second with a gesture, being ignorant of the prohibition while physically capable of prostration, and repeats this error in the second rak'ah, then realizes the mistake before the tasleem (conclusion), one prostration is completed for the second rak'ah, and one additional rak'ah must be performed. This treatment is the same as if the person had forgotten the prostration entirely. This ruling is based on the principle that proceeding to the next element (like the second rak'ah's recitation) before completing the current one invalidates the current one, and the subsequent element takes its place, as established in the ruling regarding prostration of forgetfulness (sujood as-sahw).
Supporting text
The scholar Al-Qadi states that the first rak'ah is completed by the second prostration performed via gesture. This view aligns with the position of the Shafi'i school. However, this contradicts the primary view of our school (Hanbali, implied by context) because beginning the recitation of the second rak'ah before completing the first invalidates the first, making the second the new first rak'ah.