Prophet doesn't know his future

حَدَّثَنَا سَعِيدُ بْنُ عُفَيْرٍ، حَدَّثَنِي اللَّيْثُ، حَدَّثَنِي عُقَيْلٌ، عَنِ ابْنِ شِهَابٍ، أَخْبَرَنِي خَارِجَةُ بْنُ زَيْدِ بْنِ ثَابِتٍ، أَنَّ أُمَّ الْعَلاَءِ ـ امْرَأَةً مِنَ الأَنْصَارِ بَايَعَتْ رَسُولَ اللَّهِ صلى الله عليه وسلم ـ أَخْبَرَتْهُ أَنَّهُمُ اقْتَسَمُوا الْمُهَاجِرِينَ قُرْعَةً‏.‏ قَالَتْ فَطَارَ لَنَا عُثْمَانُ بْنُ مَظْعُونٍ، وَأَنْزَلْنَاهُ فِي أَبْيَاتِنَا، فَوَجِعَ وَجَعَهُ الَّذِي تُوُفِّيَ فِيهِ، فَلَمَّا تُوُفِّيَ غُسِّلَ وَكُفِّنَ فِي أَثْوَابِهِ دَخَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقُلْتُ رَحْمَةُ اللَّهِ عَلَيْكَ أَبَا السَّائِبِ، فَشَهَادَتِي عَلَيْكَ لَقَدْ أَكْرَمَكَ اللَّهُ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ وَمَا يُدْرِيكِ أَنَّ اللَّهَ أَكْرَمَهُ ‏"‏‏.‏ فَقُلْتُ بِأَبِي أَنْتَ يَا رَسُولَ اللَّهِ فَمَنْ يُكْرِمُهُ اللَّهُ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ أَمَّا هُوَ فَوَاللَّهِ لَقَدْ جَاءَهُ الْيَقِينُ، وَاللَّهِ إِنِّي لأَرْجُو لَهُ الْخَيْرَ، وَوَاللَّهِ مَا أَدْرِي وَأَنَا رَسُولُ اللَّهِ مَاذَا يُفْعَلُ بِي ‏"‏‏.‏ فَقَالَتْ وَاللَّهِ لاَ أُزَكِّي بَعْدَهُ أَحَدًا أَبَدًا‏.‏

Narrated Kharija bin Zaid bin Thabit: Um Al-Ala an Ansari woman who had given a pledge of allegiance to Allah's Messenger (ﷺ) told me: , "The Muhajirln (emigrants) were distributed amongst us by drawing lots, and we got Uthman bin Maz'un in our share. We made him stay with us in our house. Then he suffered from a disease which proved fatal. When he died and was given a bath and was shrouded in his clothes. Allah's Messenger (ﷺ) came, I said, (addressing the dead body), 'O Aba As-Sa'ib! May Allah be Merciful to you! I testify that Allah has honored you.' Allah's Messenger (ﷺ) said, 'How do you know that Allah has honored him?" I replied, 'Let my father be sacrificed for you, O Allah's Messenger (ﷺ)! On whom else shall Allah bestow. His honor?' Allah's Messenger (ﷺ) said, 'As for him, by Allah, death has come to him. By Allah, I wish him all good (from Allah). By Allah, in spite of the fact that I am Allah's Messenger (ﷺ), I do not know what Allah will do to me.", Um Al-`Ala added, "By Allah, I will never attest the righteousness of anybody after that."

Sahih al-Bukhari 7003 https://sunnah.com/bukhari:7003

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حَدَّثَنَا عَبْدَانُ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ خَارِجَةَ بْنِ زَيْدِ بْنِ ثَابِتٍ، عَنْ أُمِّ الْعَلاَء ِ ـ وَهْىَ امْرَأَةٌ مِنْ نِسَائِهِمْ بَايَعَتْ رَسُولَ اللَّهِ صلى الله عليه وسلم ـ قَالَتْ طَارَ لَنَا عُثْمَانُ بْنُ مَظْعُونٍ فِي السُّكْنَى حِينَ اقْتَرَعَتِ الأَنْصَارُ عَلَى سُكْنَى الْمُهَاجِرِينَ، فَاشْتَكَى فَمَرَّضْنَاهُ حَتَّى تُوُفِّيَ، ثُمَّ جَعَلْنَاهُ فِي أَثْوَابِهِ فَدَخَلَ عَلَيْنَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَقُلْتُ رَحْمَةُ اللَّهِ عَلَيْكَ أَبَا السَّائِبِ، فَشَهَادَتِي عَلَيْكَ لَقَدْ أَكْرَمَكَ اللَّهُ‏.‏ قَالَ ‏"‏ وَمَا يُدْرِيكِ ‏"‏‏.‏ قُلْتُ لاَ أَدْرِي وَاللَّهِ‏.‏ قَالَ ‏"‏ أَمَّا هُوَ فَقَدْ جَاءَهُ الْيَقِينُ، إِنِّي لأَرْجُو لَهُ الْخَيْرَ مِنَ اللَّهِ، وَاللَّهِ مَا أَدْرِي وَأَنَا رَسُولُ اللَّهِ مَا يُفْعَلُ بِي وَلاَ بِكُمْ ‏"‏‏.‏ قَالَتْ أُمُّ الْعَلاَءِ فَوَاللَّهِ لاَ أُزَكِّي أَحَدًا بَعْدَهُ‏.‏ قَالَتْ وَرَأَيْتُ لِعُثْمَانَ فِي النَّوْمِ عَيْنًا تَجْرِي، فَجِئْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَذَكَرْتُ ذَلِكَ لَهُ فَقَالَ ‏"‏ ذَاكِ عَمَلُهُ يَجْرِي لَهُ ‏"‏

Narrated Kharija bin Zaid bin Thabit: Um Al-Ala an Ansari woman who had given the Pledge of allegiance to Allah's Messenger (ﷺ) said, "Uthman bin Maz'un came in our share when the Ansars drew lots to distribute the emigrants (to dwell) among themselves, He became sick and we looked after (nursed) him till he died. Then we shrouded him in his clothes. Allah's Messenger (ﷺ) came to us, I (addressing the dead body) said, "May Allah's Mercy be on you, O Aba As-Sa'ib! I testify that Allah has honored you." The Prophet (ﷺ) said, 'How do you know that?' I replied, 'I do not know, by Allah.' He said, 'As for him, death has come to him and I wish him all good from Allah. By Allah, though I am Allah's Messenger (ﷺ), I neither know what will happen to me, nor to you.'" Um Al-Ala said, "By Allah, I will never attest the righteousness of anybody after that." She added, "Later I saw in a dream, a flowing spring for Uthman. So I went to Allah's Messenger (ﷺ) and mentioned that to him. He said, 'That is (the symbol of) his good deeds (the reward for) which is going on for him.' "

Sahih al-Bukhari 7018 https://sunnah.com/bukhari:7018