English translation
366. Ubaidullāh bin 'Abdullāh bin Mas'ūd narrated from his father ('Abdullāh bin Mas'ūd) that he said: "When Allāh's Messenger ﷺ sat for the first two Rak'ah it was as if he was on hot stones.” Shu'bah (one of the narrators) said: “Then Sa’d’s lips moved (saying) something. So I said: ‘Until he stood?’ He said: ‘Until he stood.’” (Ḍā'if) Abū 'Eisā said: This Hadīth is Ḥasan, except that Abū 'Ubaidah (one of the narrators) did not hear from his father. This is acted upon according to the people of knowledge. They refer that a man does not sit long after the first two Rak'ah, and that he does not add anything to the Tashah-hud after the first two Rak'ah. They say that if he adds to the Tashah-hud then he has to perform two prostrations for As-Sahw. This has been related from Ash-Sha'bī and others.