Ibn Abbas said:

“Umar used to ask me questions in front of the Companions of the Prophet. So Abdur-Rahman bin Awf said to him: ‘Why do you ask him, while we have children like him?’” He said: “Umar said to him: ‘It is because of what you know (about him).’ So he asked him about this Ayah: ‘When there comes the help of Allah and the Conquest.’ I said: “It is only regarding the (end of the) life span of the Messenger of Allah, informing him of it.” Then he recited the Surat until its end. So Umar said to him: “By Allah! I know not about it, but what you know.”

حَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ، حَدَّثَنَا سُلَيْمَانُ بْنُ دَاوُدَ، عَنْ شُعْبَةَ، عَنْ أَبِي بِشْرٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، رضى الله عنهما قَالَ كَانَ عُمَرُ يَسْأَلُنِي مَعَ أَصْحَابِ النَّبِيِّ ﷺ فَقَالَ لَهُ عَبْدُ الرَّحْمَنِ بْنُ عَوْفٍ أَتَسْأَلُهُ وَلَنَا بَنُونَ مِثْلُهُ فَقَالَ لَهُ عُمَرُ إِنَّهُ مِنْ حَيْثُ تَعْلَمُ فَسَأَلَهُ عَنْ هَذِهِ الآيَةِ : ( إذا جَاءَ نَصْرُ اللَّهِ وَالْفَتْحُ ) فَقُلْتُ إِنَّمَا هُوَ أَجَلُ رَسُولِ اللَّهِ ﷺ أَعْلَمَهُ إِيَّاهُ وَقَرَأَ السُّورَةَ إِلَى آخِرِهَا فَقَالَ لَهُ عُمَرُ وَاللَّهِ مَا أَعْلَمُ مِنْهَا إِلاَّ مَا تَعْلَمُ .

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .