The Messenger of Allah ﷺ saw a person praying after the congregational prayer at dawn was over. The Messenger of Allah ﷺ said: There are two rak'ahs of the dawn prayer (i.e. the prescribed rak'ahs). The man replied: I did not pray the two rak'ahs before the dawn prayer. Hence I offered them now. The Messenger of Allah ﷺ kept silent. (Using translation from Abū Dāʾūd 1267)
رَأَى رَسُولُ اللَّهِ ﷺ رَجُلًا يُصَلِّي بَعْدَ صَلَاةِ الصُّبْحِ رَكْعَتَيْنِ فَقَالَ رَسُولُ اللَّهِ ﷺ «أَصَلَاةُ الصُّبْحِ مَرَّتَيْنِ؟» فَقَالَ الرَّجُلُ لَمْ أَكُنْ صَلَّيْتُ الرَّكْعَتَيْنِ اللَّتَيْنِ قَبْلَهَا فَصَلَّيْتُهَا الْآنَ قَالَ فَسَكَتَ عَنْهُ رَسُولُ اللَّهِ ﷺ