﴿ إِنَّ رَبَّكَ هُوَ أَعْلَمُ بِمَن ضَلَّ عَن سَبِيلِهِۦ وَهُوَ أَعْلَمُ بِٱلْمُهْتَدِينَ ﴾

“Verily, thy Sustainer alone is fully aware as to who has strayed from His path, Just as He alone is fully aware of those who have found the right way.”

(Lo! thy Lord) O Muhammad (is best aware of him who strayeth from His way) from His religion, i.e. Abu Jahl and his host, (and He is best aware of those who walk aright) and He is best aware of those who are guided to His religion, i.e. Abu Bakr and his fellow believers.