Narrated Um Al-Ala:

That when the Ansar drew lots as to which of the emigrants should dwell with which of the Ansar, the name of Uthman bin Mazun came out (to be in their lot). Um Al-Ala further said, "Uthman stayed with us, and we nursed him when he got sick, but he died. We shrouded him in his clothes, and Allah's Apostle came to our house and I said, (addressing the dead 'Uthman), 'O Abu As-Sa'ib! May Allah be merciful to you. I testify that Allah has blessed you.' The Prophet ﷺ said to me, "How do you know that Allah has blessed him?" I replied, 'I do not know O Allah's Apostle! May my parents be sacrificed for you.' Allah's Apostle ﷺ said, 'As regards Uthman, by Allah he has died and I really wish him every good, yet, by Allah, although I am Allah's Apostle, I do not know what will be done to him.' Um Al-Ala added, 'By Allah I shall never attest the piety of anybody after him. And what Allah's Apostles said made me sad." Um Al-Ala further said, "Once I slept and saw in a dream, a flowing stream for Uthman. So I went to Allah's Apostle and told him about it, he said, 'That is (the symbol of) his deeds."

حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ حَدَّثَنِي خَارِجَةُ بْنُ زَيْدٍ الأَنْصَارِيُّ، أَنَّ أُمَّ الْعَلاَءِ، امْرَأَةً مِنْ نِسَائِهِمْ قَدْ بَايَعَتِ النَّبِيَّ ﷺ أَخْبَرَتْهُ أَنَّ عُثْمَانَ بْنَ مَظْعُونٍ طَارَ لَهُ سَهْمُهُ فِي السُّكْنَى حِينَ أَقْرَعَتِ الأَنْصَارُ سُكْنَى الْمُهَاجِرِينَ. قَالَتْ أُمُّ الْعَلاَءِ فَسَكَنَ عِنْدَنَا عُثْمَانُ بْنُ مَظْعُونٍ، فَاشْتَكَى، فَمَرَّضْنَاهُ حَتَّى إِذَا تُوُفِّيَ وَجَعَلْنَاهُ فِي ثِيَابِهِ دَخَلَ عَلَيْنَا رَسُولُ اللَّهِ ﷺ فَقُلْتُ رَحْمَةُ اللَّهِ عَلَيْكَ أَبَا السَّائِبِ، فَشَهَادَتِي عَلَيْكَ لَقَدْ أَكْرَمَكَ اللَّهُ. فَقَالَ لِي النَّبِيُّ ﷺ " وَمَا يُدْرِيكِ أَنَّ اللَّهَ أَكْرَمَهُ ". فَقُلْتُ لاَ أَدْرِي بِأَبِي أَنْتَ وَأُمِّي يَا رَسُولَ اللَّهِ. فَقَالَ رَسُولُ اللَّهِ ﷺ " أَمَّا عُثْمَانُ فَقَدْ جَاءَهُ ـ وَاللَّهِ ـ الْيَقِينُ وَإِنِّي لأَرْجُو لَهُ الْخَيْرَ، وَاللَّهِ مَا أَدْرِي وَأَنَا رَسُولُ اللَّهِ مَا يُفْعَلُ بِي ". قَالَتْ فَوَاللَّهِ لاَ أُزَكِّي أَحَدًا بَعْدَهُ أَبَدًا، وَأَحْزَنَنِي ذَلِكَ قَالَتْ فَنِمْتُ فَأُرِيتُ لِعُثْمَانَ عَيْنًا تَجْرِي، فَجِئْتُ إِلَى رَسُولِ اللَّهِ ﷺ فَأَخْبَرْتُهُ فَقَالَ " ذَلِكَ عَمَلُهُ ".