Dhikr after prayer — La ilaha illallah 10 times
لا إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لا...
لا إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لا شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ
La ilaha illal-lahu wahdahu la shareeka lah, lahul-mulku walahul-hamd, wahuwa AAala kulli shayin qadeer
Translation
None has the right to be worshipped except Allah, alone, without partner, to Him belongs all sovereignty and praise and He is over all things omnipotent.
When to recite
Recited ten times after Fajr and Maghrib prayer. Each time equals freeing ten slaves, earns ten good deeds and erases ten sins.
Source / Reference
At-Tirmithi 5/515