Surah Al-Hajj (The Pilgrimage), Verse 15

مَنْ كَانَ یَظُنُّ اَنْ لَّنْ یَّنْصُرَهُ اللّٰهُ فِی الدُّنْیَا وَالْاٰخِرَةِ فَلْیَمْدُدْ بِسَبَبٍ اِلَی السَّمَآءِ ثُمَّ لْیَقْطَعْ فَلْیَنْظُرْ هَلْ یُذْهِبَنَّ كَیْدُهٗ مَا یَغِیْظُ ۟

Man kaana yazunnu allai yansurahul laahu fid dunyaa wal aakhirati fal yamdud bisababin ilas samaaa'i summal yaqta' falyanzur hal yuzhibanna kaiduhoo maa yagheez

“If any think that Allah will not help him (His Messenger) in this world and the Hereafter, let him stretch out a rope to the ceiling and cut (himself) off: then let him see whether his plan will remove that which enrages (him)!”

Quran 22:15 (Yusuf Ali Translation)