Nahj al-Balāgha
Hadith 1910۳۵۱. وَقَالَ (عليه السلام): عِنْدَ تَنَاهِي الشِّدَّةِ تَكُونُ الْفَرْجَةُ، وَعِنْدَ تَضَايُقِ حَلَقِ الْبَلاَءِ يَكُونُ الرَّخَاءُ.
351. Amīr al-mu’minīn, peace be upon him, said: At the extremity of hardship comes relief, and at the tightening of the chains of tribulation comes ease.