Reference : Hisn al-Muslim 72

لاَ إِلَهَ إِلاَّ اللَّهُ
وَحْدَهُ لاَ شَرِيكَ لَهُ
لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ
يُحْيِي وَيُمِيتُ
وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ
(عَشْرَ مَرّاتٍ بَعْدَ صَلاةِ الْمَغْرِبِ وَالصُّبْحِ)
Lā ilāha illallāh
waḥdahu lā sharīka lah, 
lahu‘l-mulku wa lahu‘l-ḥamd 
yuḥyī wa yumīt
wa huwa `alā kulli shay'in qadīr.

(Recite ten times in Arabic after the Maghrib and Fajr prayers.)

None has the right to be worshipped but Allah alone, Who has no partner. 
His is the dominion and His is the praise. 
He brings life and He causes death, 
and He is Able to do all things. 


Reference:
At-Tirmidhi 5/515, Ahmad 4/227. See its checking in Ibn Al-Qayyim 
Al-Jawziyyah's Zddul-Ma'ad 1/300.

Chapter: After salam