Say the following statement 10 times -

لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ، لَهُ الْمُلْكُ، وَلَهُ الْحَمْدُ، وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ

Laa ilahaa illAllahu wahdahu laa sharika lahu, lahul-mulku wa lahul-hamdu wa huwa 'alaa kulli shay'in qadir

None has the right to be worshipped but Allah alone, Who has no partner. His is the dominion and His is the praise, and He is Able to do all things. The Prophet (ﷺ) said: The person who says the above statement 10 times It would be as if he had freed four of Ishmael's (As) children from slavery.

Reference: Bukhari: 6404