22:15
مَن كَانَ يَظُنُّ أَن لَّن يَنصُرَهُ ٱللَّهُ فِى ٱلدُّنْيَا وَٱلْـَٔاخِرَةِ فَلْيَمْدُدْ بِسَبَبٍ إِلَى ٱلسَّمَآءِ ثُمَّ لْيَقْطَعْ فَلْيَنظُرْ هَلْ يُذْهِبَنَّ كَيْدُهُۥ مَا يَغِيظُ
Whoever should think that Allah will not support [Prophet Muhammad] in this world and the Hereafter - let him extend a rope to the ceiling, then cut off [his breath], and let him see: will his effort remove that which enrages [him]?
Context in Surah Al-Hajj
Nearby ayahs help place verse 22:15 in sequence and meaning.
يَدْعُوا۟ لَمَن ضَرُّهُۥٓ أَقْرَبُ مِن نَّفْعِهِۦ ۚ لَبِئْسَ ٱلْمَوْلَىٰ وَلَبِئْسَ ٱلْعَشِيرُ
He invokes one whose harm is closer than his benefit - how wretched the protector and how wretched the associate.
إِنَّ ٱللَّهَ يُدْخِلُ ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّـٰلِحَـٰتِ جَنَّـٰتٍ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَـٰرُ ۚ إِنَّ ٱللَّهَ يَفْعَلُ مَا يُرِيدُ
Indeed, Allah will admit those who believe and do righteous deeds to gardens beneath which rivers flow. Indeed, Allah does what He intends.
وَكَذَٰلِكَ أَنزَلْنَـٰهُ ءَايَـٰتٍۭ بَيِّنَـٰتٍ وَأَنَّ ٱللَّهَ يَهْدِى مَن يُرِيدُ
And thus have We sent the Qur'an down as verses of clear evidence and because Allah guides whom He intends.
إِنَّ ٱلَّذِينَ ءَامَنُوا۟ وَٱلَّذِينَ هَادُوا۟ وَٱلصَّـٰبِـِٔينَ وَٱلنَّصَـٰرَىٰ وَٱلْمَجُوسَ وَٱلَّذِينَ أَشْرَكُوٓا۟ إِنَّ ٱللَّهَ يَفْصِلُ بَيْنَهُمْ يَوْمَ ٱلْقِيَـٰمَةِ ۚ إِنَّ ٱللَّهَ عَلَىٰ كُلِّ شَىْءٍ شَهِيدٌ
Indeed, those who have believed and those who were Jews and the Sabeans and the Christians and the Magians and those who associated with Allah - Allah will judge between them on the Day of Resurrection. Indeed Allah is, over all things, Witness.