Al-Anbiya' - 21:83

وَأَيُّوبَ إِذْ نَادَى رَبَّهُ أَنِّي مَسَّنِيَ الضُّرُّ وَأَنتَ أَرْحَمُ الرَّاحِمِينَ
[21:83]
And Ayub, when he cried to his Lord, (saying): Harm has afflicted me, and Thou art the most Merciful of the merciful.
And (remember) Job, when He cried to his Lord, "Truly distress has seized me, but Thou art the Most Merciful of those that are merciful."
And Job, when he cried unto his Lord, (saying): Lo! adversity afflicteth me, and Thou art Most Merciful of all who show mercy.