The Prophet ﷺ said, "If anyone forgets a prayer he should pray that prayer when he remembers it. There is no expiation except to pray the same." Then he recited: "Establish prayer for My (i.e. Allah's) remembrance." (20.14).  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ نَسِيَ صَلاَةً فَلْيُصَلِّ إِذَا ذَكَرَهَا لاَ كَفَّارَةَ لَهَا إِلاَّ ذَلِكَ {وَأَقِمِ الصَّلاَةَ لِذِكْرِي} قَالَ مُوسَى قَالَ هَمَّامٌ سَمِعْتُهُ يَقُولُ بَعْدُ {وَأَقِمِ الصَّلاَةَ لِذِكْرِي}وَقَالَ حَبَّانُ حَدَّثَنَا هَمَّامٌ حَدَّثَنَا قَتَادَةُ حَدَّثَنَا أَنَسٌ عَنِ النَّبِيِّ ﷺ نَحْوَهُ  

He who forgets the prayer should say it when he remembers it, there is no explation for it, except this. Qatada said: (Allah says)" And observe prayer for remembrance of Me"  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ نَسِيَ صَلاَةً فَلْيُصَلِّهَا إِذَا ذَكَرَهَا لاَ كَفَّارَةَ لَهَا إِلاَّ ذَلِكَ قَالَ قَتَادَةُ وَأَقِمِ الصَّلاَةَ لِذِكْرِي  

[Machine] "The Prophet ﷺ said, 'Whoever forgets a prayer should offer it when they remember it, as there is no expiation for it except for that. After that, Allah revealed in the Quran, 'Establish prayer for My remembrance.'" (Surah Taha, 20:14)  

أَنَّ النَّبِيَّ ﷺ قَالَ مَنْ نَسِيَ صَلَاةً فَلْيُصَلِّهَا إِذَا ذَكَرَهَا لَا كَفَّارَةَ لَهَا غَيْرُ ذَلِكَ وَحَدَّثَنَا بَعْدَ ذَلِكَ فَزَادَ فِيهِ {أَقِمِ الصَّلَاةَ لِذِكْرِي} [طه 14]  

[Machine] The Messenger of Allah, ﷺ , said: "Whoever forgets a prayer, let him perform it when he remembers it, as there is no expiation for it except that." Qatadah said: "{Establish prayer for My remembrance}" [Surah Taha 20:14]  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَنْ نَسِيَ صَلَاةً فَلْيُصَلِّهَا إِذَا ذَكَرَهَا لَا كَفَّارَةَ لَهَا إِلَّا ذَلِكَ قَالَ قَتَادَةُ { أَقِمِ الصَّلَاةَ لِذِكْرِي } [طه 14]