A person entered the mosque, while the Messenger of Allah ﷺ was leading the dawn prayer. He observed two rak'ahs in a corner of the mosque, and then joined the Messenger of Allah ﷺ in prayer. When the Messenger of Allah ﷺ had pronounced salutations (he had concluded the prayer), he said: O, so and so, which one out of these two prayers did you count (as your Fard prayer), the one that you observed alone or the prayer that you observed with us?
دَخَلَ رَجُلٌ الْمَسْجِدَ وَرَسُولُ اللَّهِ ﷺ فِي صَلاَةِ الْغَدَاةِ فَصَلَّى رَكْعَتَيْنِ فِي جَانِبِ الْمَسْجِدِ ثُمَّ دَخَلَ مَعَ رَسُولِ اللَّهِ ﷺ فَلَمَّا سَلَّمَ رَسُولُ اللَّهِ ﷺ قَالَ يَا فُلاَنُ بِأَىِّ الصَّلاَتَيْنِ اعْتَدَدْتَ أَبِصَلاَتِكَ وَحْدَكَ أَمْ بِصَلاَتِكَ مَعَنَا