The Quran

وَما أَرسَلنا مِن رَسولٍ إِلّا لِيُطاعَ بِإِذنِ اللَّهِ ۚ وَلَو أَنَّهُم إِذ ظَلَموا أَنفُسَهُم جاءوكَ فَاستَغفَرُوا اللَّهَ وَاستَغفَرَ لَهُمُ الرَّسولُ لَوَجَدُوا اللَّهَ تَوّابًا رَحيمًا

Muhammad Asad

for We have never sent any apostle save that he should be heeded by God's leave.¹ If, then, after having sinned against themselves, they would but come round to thee and ask God to forgive them - with the Apostle, too, praying that they be forgiven - they would assuredly find that God is an acceptor of repentance, a dispenser of grace.

The expression "by God's leave" is to be understood, in this context, as "with God's help" or "by God's grace" (Zamakhshari, Razi). As so often in the Qur'an, the sudden change, within one and the same sentence, from the pronoun "We" or "I" to "He", or from "We" to "God", is meant to impress upon the listener or reader of the Qur'an the fact that God is not a "person" but an all-embracing Power that cannot be defined or even adequately referred to within the limited range of any human language.