From this conversation, Rasulullah (sallallahu ‘alaihi wasallam) was given the impression that perhaps Abu Taalib wanted to cease assisting and protecting him. So with tearful eyes and a sorrowful heart, Rasulullah (sallallahu ‘alaihi wasallam) said, “Uncle! By Allah! If these people place the sun in my right hand and the moon in my left hand and ask me to cease this mission, I will never do so until Allah Ta‘ala either grants this deen dominance in the world or I perish in the process.”
Saying this, Rasulullah (sallallahu ‘alaihi wasallam) began to weep and stood up to leave. Abu Taalib called for him and said, “My beloved nephew! You may continue with your mission and do as you please. I will never surrender you to your enemies.”
(Extracted from Seeratul Mustafa 1/175)