You are reading a tafsir for the group of verses 73:15 to 73:19
انا ارسلنا اليكم رسولا شاهدا عليكم كما ارسلنا الى فرعون رسولا ١٥ فعصى فرعون الرسول فاخذناه اخذا وبيلا ١٦ فكيف تتقون ان كفرتم يوما يجعل الولدان شيبا ١٧ السماء منفطر به كان وعده مفعولا ١٨ ان هاذه تذكرة فمن شاء اتخذ الى ربه سبيلا ١٩
إِنَّآ أَرْسَلْنَآ إِلَيْكُمْ رَسُولًۭا شَـٰهِدًا عَلَيْكُمْ كَمَآ أَرْسَلْنَآ إِلَىٰ فِرْعَوْنَ رَسُولًۭا ١٥ فَعَصَىٰ فِرْعَوْنُ ٱلرَّسُولَ فَأَخَذْنَـٰهُ أَخْذًۭا وَبِيلًۭا ١٦ فَكَيْفَ تَتَّقُونَ إِن كَفَرْتُمْ يَوْمًۭا يَجْعَلُ ٱلْوِلْدَٰنَ شِيبًا ١٧ ٱلسَّمَآءُ مُنفَطِرٌۢ بِهِۦ ۚ كَانَ وَعْدُهُۥ مَفْعُولًا ١٨ إِنَّ هَـٰذِهِۦ تَذْكِرَةٌۭ ۖ فَمَن شَآءَ ٱتَّخَذَ إِلَىٰ رَبِّهِۦ سَبِيلًا ١٩
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3

The arrival of a prophet was meant to ensure that the distinction between Truth and falsehood was clearly understood and that, finally, the Truth was opted for. Such a decision about these alternatives had taken place earlier between Moses and Pharaoh. Then the same type of decision had to be arrived at between the Prophet Muhammad and the Quraysh. Those who do not bow down before the missionary of God in this world, run the risk of having to bow down before God’s punishment in the Hereafter.