Prophet's Role vs. Divine Authority

قُل لَّآ أَمْلِكُ لِنَفْسِى ضَرًّا وَلَا نَفْعًا إِلَّا مَا شَآءَ ٱللَّهُ ۗ لِكُلِّ أُمَّةٍ أَجَلٌ ۚ إِذَا جَآءَ أَجَلُهُمْ فَلَا يَسْتَـْٔخِرُونَ سَاعَةً ۖ وَلَا يَسْتَقْدِمُونَ

Say, "I possess not for myself any harm or benefit except what Allāh should will. For every nation is a [specified] term. When their time has come, then they will not remain behind an hour, nor will they precede [it]."