Prophet was not illiterate

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا سُفْيَانُ، عَنْ سُلَيْمَانَ الأَحْوَلِ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، قَالَ قَالَ ابْنُ عَبَّاسٍ يَوْمُ الْخَمِيسِ وَمَا يَوْمُ الْخَمِيسِ اشْتَدَّ بِرَسُولِ اللَّهِ صلى الله عليه وسلم وَجَعُهُ فَقَالَ ‏"‏ ائْتُونِي أَكْتُبْ لَكُمْ كِتَابًا لَنْ تَضِلُّوا بَعْدَهُ أَبَدًا ‏"‏‏.‏ فَتَنَازَعُوا، وَلاَ يَنْبَغِي عِنْدَ نَبِيٍّ تَنَازُعٌ، فَقَالُوا مَا شَأْنُهُ أَهَجَرَ اسْتَفْهِمُوهُ فَذَهَبُوا يَرُدُّونَ عَلَيْهِ‏.‏ فَقَالَ ‏"‏ دَعُونِي فَالَّذِي أَنَا فِيهِ خَيْرٌ مِمَّا تَدْعُونِي إِلَيْهِ ‏"‏‏.‏ وَأَوْصَاهُمْ بِثَلاَثٍ قَالَ ‏"‏ أَخْرِجُوا الْمُشْرِكِينَ مِنْ جَزِيرَةِ الْعَرَبِ، وَأَجِيزُوا الْوَفْدَ بِنَحْوِ مَا كُنْتُ أُجِيزُهُمْ ‏"‏‏.‏ وَسَكَتَ عَنِ الثَّالِثَةِ، أَوْ قَالَ فَنَسِيتُهَا‏.‏

Narrated Ibn Abbas: Thursday! And how great that Thursday was! The ailment of Allah's Messenger (ﷺ) became worse (on Thursday) and he said, fetch me something so that I may write to you something after which you will never go astray." The people (present there) differed in this matter, and it was not right to differ before a prophet. Some said, "What is wrong with him ? (Do you think ) he is delirious (seriously ill)? Ask him ( to understand his state )." So they went to the Prophet (ﷺ) and asked him again. The Prophet (ﷺ) said, "Leave me, for my present state is better than what you call me for." Then he ordered them to do three things. He said, "Turn the pagans out of the 'Arabian Peninsula; respect and give gifts to the foreign delegations as you have seen me dealing with them." (Said bin Jubair, the sub-narrator said that Ibn `Abbas kept quiet as rewards the third order, or he said, "I forgot it.")

Sahih al-Bukhari 4431 https://sunnah.com/bukhari:4431

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حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، أَخْبَرَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، حَدَّثَنَا صَالِحُ بْنُ كَيْسَانَ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتْ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم فِي مَرَضِهِ ‏ "‏ ادْعِي لِي أَبَا بَكْرٍ وَأَخَاكِ حَتَّى أَكْتُبَ كِتَابًا فَإِنِّي أَخَافُ أَنْ يَتَمَنَّى مُتَمَنٍّ وَيَقُولَ قَائِلٌ أَنَا أَوْلَى ‏.‏ وَيَأْبَى اللَّهُ وَالْمُؤْمِنُونَ إِلاَّ أَبَا بَكْرٍ ‏"‏ ‏.‏

A'isha reported that Allah's Messenger (ﷺ) in his (last) illness asked me to call Abu Bakr, her father, and her brother too, so that he might write a document, for he feared that someone else might be desirous (of succeeding him) and that some claimant may say: I have better claim to it, whereas Allah and the Faithful do not substantiate the claim of anyone but that of Abu Bakr.

Sahih Muslim 2387 https://sunnah.com/muslim:2387

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حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْبَرَاءِ بْنِ عَازِبٍ، قَالَ لَمَّا نَزَلَتْ ‏: ‏ ‏(‏لَا يَسْتَوِي الْقَاعِدُونَ مِنَ الْمُؤْمِنِينَ ‏)‏ جَاءَ عَمْرُو ابْنُ أُمِّ مَكْتُومٍ إِلَى النَّبِيِّ صلى الله عليه وسلم - قَالَ وَكَانَ ضَرِيرَ الْبَصَرِ فَقَالَ يَا رَسُولَ اللَّهِ مَا تَأْمُرُنِي إِنِّي ضَرِيرُ الْبَصَرِ فَأَنْزَلَ اللَّهُ تَعَالَى هَذِهِ الآيَةَ ‏: ‏ ‏(‏ غَيْرُ أُولِي الضَّرَرِ ‏)‏ الآيَةَ ‏.‏ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ ائْتُونِي بِالْكَتِفِ وَالدَّوَاةِ أَوِ اللَّوْحِ وَالدَّوَاةِ ‏"‏ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ ‏.‏ وَيُقَالُ عَمْرُو ابْنُ أُمِّ مَكْتُومٍ وَيُقَالُ عَبْدُ اللَّهِ ابْنُ أُمِّ مَكْتُومٍ وَهُوَ عَبْدُ اللَّهِ بْنُ زَائِدَةَ وَأُمُّ مَكْتُومٍ أُمُّهُ ‏.‏

Narrated Al-Bara bin 'Azib: "When the following was revealed: 'Not equal are those of the believers who sit (4: 95)' 'Amr bin Umm Maktum came to the Prophet (ﷺ)." He said: "He was blind, so he said: 'O Messenger of Allah! What do you order me with? Indeed my vision is disabled.' So Allah [Most High] revealed this Ayah: 'Except those who are disabled.' So the Prophet (ﷺ) said: 'Bring me a shoulder bone and inkwell' - or 'Bring me a tablet and an inkwell.'"

Jami` at-Tirmidhi 3031 https://sunnah.com/tirmidhi:3031