Why is it wrong to rejoice when calamity befalls someone hating us? Upright Job never rejoiced if calamity befell someone hating him.
لَا ،‏ لَمْ أَدَعْ حَنَكِي يُخْطِئُ بِطَلَبِ لَعْنَةٍ عَلَى نَفْسِهِ » .‏ —‏ اي ٣١ :‏ ​ ٢٩ ،‏ ٣٠‏ .‏