مَنْ كَانَ يَظُنُّ اَنْ لَّنْ يَّنْصُرَهُ اللّٰهُ فِى الدُّنْيَا وَالْاٰخِرَةِ فَلْيَمْدُدْ بِسَبَبٍ اِلَى السَّمَاۤءِ ثُمَّ لْيَقْطَعْ فَلْيَنْظُرْ هَلْ يُذْهِبَنَّ كَيْدُهٗ مَا يَغِيْظُ ( الحج: ١٥ )
Man kaana yazunnu allai yansurahul laahu fid dunyaa wal aakhirati fal yamdud bisababin ilas samaaa'i summal yaqta' falyanzur hal yuzhibanna kaiduhoo maa yagheez (al-Ḥajj 22:15)
Whoever should think that Allah will not support him [i.e., 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]? (Al-Hajj  : 15)
1 Mufti Taqi Usmani
If someone thinks that Allah will never help him (the prophet) in this world and in the Hereafter, he should stretch a rope to the sky, then cut (Allah’s communication) off (from the prophet) and see whether his effort can really remove what irritates (him).