Prayer missed and remembered

عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ: مَنْ نَسِيَ صَلاَةً فَلْيُصَلِّ إِذَا ذَكَرَهَا، لاَ كَفَّارَةَ لَهَا إِلاَّ ذَلِكَ

Hazrat Anas^ra narrated that the Holy Prophet^sa said: “Whoever forgets a prayer should perform it as soon as he remembers. There is no atonement for it other than that.”

(Sahih al-Bukhari, Kitab mawaqiti s-salah, Bab man nasiya salatan fal-yusalli idha dhakaraha wa la yu‘idu illa tilka s-salah, Hadith 597)