I need a supplication to say at the end of prayer…

Walaikum assalam wa rahmatullah,

One dua is: [a reading of it is attached]

اللَّهُمَّ إِنِّي ظَلَمْتُ نَفْسِي ظُلْمًا كَثِيرًا

وَلَا يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ

فَاغْفِرْ لِي مَغْفِرَةً مِنْ عِنْدِكَ وَارْحَمْنِي

إِنَّك أَنْتَ الْغَفُورُ الرَّحِيمُ

It is a hadith related by Bukhari, Muslim, and others, in which the Messenger of Allah (Allah bless him and give him peace) taught Abu Bakr (Allah be pleased with him) a supplication to say at the end of his prayer, namely:

‘O Allah, I have wronged myself a great wronging, and none but you forgives sins. So forgive me with forgiveness from You, and grant me mercy, for You are the Forgiving and Merciful.’

Note that it is a confirmed sunna to make dua before the final salams in prayer. Any dua for non-worldly matters will fulfill this sunna, [Maraqi al-Falah, Durr al-Mukhtar] but it is best to try to make a heart-felt dua using the duas of the Beloved of Allah (Allah bless him and give him peace), for the words of the beloved are beloved to the Beloved.

And Allah alone gives success.

Wassalam,

Faraz Rabbani