Moosaa Richardson introduces an amazing 10-Part Prophetic supplication which may help a person turn his life around and purify his soul. It should be used frequently at the ends of gatherings.
Use this fully-voweled Arabic text of the supplication (PDF) to follow along and learn the supplication: http://www.bakkah.net/en/wp-content/uploads/2017/05/DUAA-for-ten-things-TIRMITHEE.pdf
From a Friday khutbah delivered at al-Masjid al-Awwal in Pittsburgh, Pennsylvania (USA) on 1438.08.08.