[Machine] The Messenger of Allah ﷺ prayed and added or subtracted [the number of units]. Ibrahim said, "And the assumed mistake is from me." So, it was said, "O Messenger of Allah, should I increase in prayer?" He said, "I am only a human being, I forget just as you forget. So, if any one of you forgets, he should perform two prostrations while sitting." Then, the Messenger of Allah ﷺ turned and performed two prostrations.  

صَلَّى رَسُولُ اللهِ ﷺ فَزَادَ أَوْ نَقَصَ قَالَ إِبْرَاهِيمُ وَالْوَهْمُ مِنِّي فَقِيلَ يَا رَسُولَ اللهِ أَزِيدَ فِي الصَّلَاةِ شَيْءٌ؟ فَقَالَ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيَ أَحَدُكُمْ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ ثُمَّ تَحَوَّلَ رَسُولُ اللهِ ﷺ فَسَجَدَ سَجْدَتَيْنِ