Arabic (Original)
وَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا قَالَ أَحَدُكُمْ آمِينَ وَالْمَلَائِكَةُ فِي السَّمَاءِ فَيُوَافِقُ إِحْدَاهُمَا الْأُخْرَى غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ.
English Translation
The Messenger of Allah (peace be upon him) said: 'When one of you says Amin and the angels in heaven say Amin, and one coincides with the other, his previous sins will be forgiven.'