Shaykh al-Islam al- Mujaddid Muhammad bin ʿAbdul-Wahhāb (rahimahullāh):
“Whoever perfects at-tawheed will enter Paradise without any reckoning.”*
*( also means without any punishment)
Source: Taken from the Lecture,’The Perfection of Tawheed| Explanation of Kitab Al-Tawheed by Shaikh Salih Al- Fawzan Lesson 5, Taught by Ustadh Hassan Somali, 2:10-2:15|1:01:03 GMT Time, Germantown Masjid (Youtube channel)