Musnad Ahmad 93
It was narrated from Abu Sinan al-Du'ali that he entered upon 'Umar bin al-Khattab with whom there was a group of the earliest Muhajireen, 'Umar sent for a basket that had been brought to him from Iraq, in which there was a ring. One of his sons took it and put it in his mouth. ‘Umar took it from him, then 'Umar wept and those who were with him said:
Why are you weeping when Allah has granted victory to you and caused you to prevail over your enemies and granted you joy? 'Umar said: I heard the Messenger of Allah ﷺ say: `Accumulation of worldly luxuries does not become available to any people but Allah, may He Be glorified and exalted, stirs up among them enmity and hatred until the Day of Resurrection, and that concerns me.`
حَدَّثَنَا حَسَنٌ، قَالَ حَدَّثَنَا ابْنُ لَهِيعَةَ، حَدَّثَنَا أَبُو الْأَسْوَدِ، أَنَّهُ سَمِعَ مُحَمَّدَ بْنَ عَبْدِ الرَّحْمَنِ ابْنِ لَبِيبَةَ، يُحَدِّثُ عَنْ أَبِي سِنَانٍ الدُّؤَلِيِّ، أَنَّهُ دَخَلَ عَلَى عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ وَعِنْدَهُ نَفَرٌ مِنْ الْمُهَاجِرِينَ الْأَوَّلِينَ فَأَرْسَلَ عُمَرُ إِلَى سَفَطٍ أُتِيَ بِهِ مِنْ قَلْعَةٍ مِنْ الْعِرَاقِ فَكَانَ فِيهِ خَاتَمٌ فَأَخَذَهُ بَعْضُ بَنِيهِ فَأَدْخَلَهُ فِي فِيهِ فَانْتَزَعَهُ عُمَرُ مِنْهُ ثُمَّ بَكَى عُمَرُ رَضِيَ اللَّهُ عَنْهُ فَقَالَ لَهُ مَنْ عِنْدَهُ لِمَ تَبْكِي وَقَدْ فَتَحَ اللَّهُ لَكَ وَأَظْهَرَكَ عَلَى عَدُوِّكَ وَأَقَرَّ عَيْنَكَ فَقَالَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ لَا تُفْتَحُ الدُّنْيَا عَلَى أَحَدٍ إِلَّا أَلْقَى اللَّهُ عَزَّ وَجَلَّ بَيْنَهُمْ الْعَدَاوَةَ وَالْبَغْضَاءَ إِلَى يَوْمِ الْقِيَامَةِ وَأَنَا أُشْفِقُ مِنْ ذَلِكَ‏.‏