Fifth Rukn of Prayer: Qa’dah al-Aakhirah
Q. Sitting how long in Qa’dah-e-Aakhirah (final sitting) is fard?
A. Sitting up to the last words of at-Tahiyyahaat: that is, up to “…’abduhu wa rasooluh”, is fard.
Q. In which prayers is Qa’dah-e-Aakhirah a fard?
A. In all types of prayers — fard, waajib, sunnat, and nafl.