Lailaha Illallah powerful zikr to earn the pleasure of Allah (swt) 

Sayyiduna Abu Hurayrah (radiyallahu ‘anhu) once asked Nabi (sallallahu ‘alayhi wa sallam), “Who will be the fortunate person to gain your intercession on the day of Qiyamah?”
Rasulullah (sallallahu ‘alayhi wa sallam) said:
“O Abu Hurayrah, I knew you would be the first to ask me about this due to your eagerness for Hadith. The fortunate person who will gain my intercession will be that person who says ‘La ilaha illallah’ sincerely from his heart.”
(Sahih Bukhari, Hadith: 99)