Messenger of Allah said: "Whoever forgets a Salat then he is to pray it when he remembers it."  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ نَسِيَ صَلاَةً فَلْيُصَلِّهَا إِذَا ذَكَرَهَا وَفِي الْبَابِ عَنْ سَمُرَةَ وَأَبِي قَتَادَةَ