﴿ وَمَا كُنتَ تَرْجُوٓا۟ أَن يُلْقَىٰٓ إِلَيْكَ ٱلْكِتَٰبُ إِلَّا رَحْمَةًۭ مِّن رَّبِّكَ ۖ فَلَا تَكُونَنَّ ظَهِيرًۭا لِّلْكَٰفِرِينَ ﴾

“Now [as for thyself, O believer,] thou couldst never foresee that this divine writ would [one day] be offered to thee: but [it did come to thee] by thy Sustainer’s grace. Hence, never uphold those who deny the truth [of divine guidance],”

(Thou hadst no hope) O Muhammad (that the Scripture would be inspired in thee) that Gabriel would come down to you with the Qur'an and that you will be a prophet; (but it is a mercy from your Lord) but it is a blessing and honour from your Lord that He sent down Gabriel to you with the Qur'an, (so never be a helper to the disbelievers) by disbelieving.