Say: "My Lord, forgive and have mercy. You are the best of the merciful."
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (and say) o muhammad: (my lord! forgive) my nation (and have mercy) on my nation by not punishing them, (for thou art best of all who show mercy) the most merciful of all who show mercy'.
Jalāl al-Dīn al-Maḥallī
تفسير : and say: ‘my lord, forgive and have mercy, on believers — [this] ‘mercy’ adds to the ‘forgiveness’ [in terms of god’s grace] — and you are the best of the merciful’, the most excellent of those who have mercy.