Some of us recited the Tashahhud while they were standing. Abu Dawud said: Ibn-Zubair made two prostrations before giving the salutation in a similar way when he stood up at the end of two rak’ahs. This is the opinion of al-Zuhrl.
عَنِ الزُّهْرِيِّ بِمَعْنَى إِسْنَادِهِ وَحَدِيثِهِ زَادَ وَكَانَ مِنَّا الْمُتَشَهِّدُ فِي قِيَامِهِ