That when the Ansar drew lots as to which of the emigrants should dwell with which of the Ansar, the name of ʿUthman 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 ʿUthman), '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 Messenger of Allah ﷺ! May my parents be sacrificed for you.' Messenger of Allah ﷺ said, 'As regards ʿUthman, by Allah he has died and I really wish him every good, yet, by Allah, although I am Messenger of Allah ﷺ, 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 Messenger of Allah ﷺs said made me sad." Um Al-Ala further said, "Once I slept and saw in a dream, a flowing stream for ʿUthman. So I went to Messenger of Allah ﷺ and told him about it, he said, 'That is (the symbol of) his deeds." (Using translation from Bukhārī 2687)   

عَنْ أُمِّ الْعَلَاءِ وَهِيَ امْرَأَةٌ مِنْ نِسَائِهِمْ كَانَتْ بَايَعَتْ رَسُولَ اللهِ ﷺ قَالَتْ صَارَ لَنَا عُثْمَانُ بْنُ مَظْعُونٍ فِي السُّكْنَى حِينَ اقْتَرَعَتِ الْأَنْصَارُ عَلَى سُكْنَى الْمُهَاجِرِينَ فَاشْتَكَى فَمَرَّضْنَاهُ حَتَّى تُوُفِّيَ ثُمَّ جَعَلْنَاهُ فِي أَثْوَابِهِ قَالَتْ فَدَخَلَ عَلَيْنَا رَسُولُ اللهِ ﷺ فَقُلْتُ رَحْمَةُ اللهِ عَلَيْكَ أَبَا السَّائِبِ فَشَهَادَتِي أَنْ قَدْ أَكْرَمَكَ اللهُ فَقَالَ النَّبِيُّ ﷺ «وَمَا يُدْرِيكِ؟» قَالَتْ لَا أَدْرِي وَاللهِ يَا رَسُولَ اللهِ قَالَ «أَمَّا هُوَ فَقَدْ جَاءَهُ الْيَقِينُ وَإِنِّي لَأَرْجُو لَهُ خَيْرًا وَاللهِ لَا أَدْرِي وَأَنَا رَسُولُ اللهِ مَا يُفْعَلُ بِي وَلَا بِكُمْ» قَالَتْ أُمُّ الْعَلَاءِ وَاللهِ لَا أُزَكِّي بَعْدَهُ أَحَدًا قَالَتْ وَأُرِيتُ لِعُثْمَانَ فِي النَّوْمِ عَيْنًا تَجْرِي فَذَكَرْتُ ذَلِكَ لَهُ فَقَالُ «ذَاكَ عَمَلُهُ»