Nafi’ reported: A son of Abdullah ibn Umar, may Allah be pleased with him, complained of an illness and Ibn Umar was very distraught over him so much that some people said: We are afraid for this old man because of what might happen to his boy! The boy died and Ibn Umar went out to his funeral. There was not a man more visibly happy than him, so he was asked why. Ibn Umar said, “Verily, it was only mercy for him and when the decree of Allah came to pass, we accepted it.”
Source: al-Riḍā ʻan Allāh bi-Qaḍāʼihi li-Ibn Abī al-Dunyā 98
عَنْ نَافِعٍ قَالَ اشْتَكَى ابْنٌ لِعَبْدِ اللَّهِ بْنِ عُمَرَ رَضِيَ الله عَنْه فَاشْتَدَّ وَجْدُهُ عَلَيْهِ حَتَّى قَالَ بَعْضُ الْقَوْمِ لَقَدْ خَشِينَا عَلَى هَذَا الشَّيْخِ أَنْ يَحْدُثَ بِهَذَا الْغُلَامِ حَدَثٌ فَمَاتَ الْغُلَامُ فَخَرَجَ ابْنُ عُمَرَ فِي جَنَازَتِهِ وَمَا رَجُلٌ أَبْدَى سُرُورًا مِنْهُ فَقِيلَ لَهُ فِي ذَلِكَ فَقَالَ ابْنُ عُمَرَ إِنَّمَا كَانَ رَحْمَةً لَهُ فَلَمَّا وَقَعَ أَمْرُ اللَّهِ رَضِينَا بِهِ
98 الرضا عن الله بقضائه لابن أبي الدنيا