[Machine] About this verse, "When the victory of Allah and the conquest comes, and you see the people entering into the religion of Allah in multitudes" [Surah An-Nasr: 2], in what context was it revealed?

Some of them said, "Allah commanded His Prophet, ﷺ , that when he sees the people and their embracing of Islam and their firmness in the religion, he should praise and seek forgiveness from Allah." Umar said, "Are you not amazed by Ibn Abbas? O Ibn Abbas, why are you silent?" He said, "He taught me when it will occur." He said, "When the victory of Allah and the conquest comes, and you see the people entering into the religion of Allah in multitudes" [Surah An-Nasr: 1], then it is your sign of death." He said, "You spoke the truth, and by the One in whose hand is my soul, I have not learned from it except what you have mentioned."  

عَنْ هَذِهِ الْآيَةِ {إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ وَرَأَيْتَ النَّاسَ} [النصر 2] فِيمَ نَزَلَتْ؟ فَقَالَ بَعْضُهُمْ «أَمَرَ اللهُ نَبِيَّهُ ﷺ إِذَا رَأَى النَّاسَ وَدُخُولَهُمْ فِي الْإِسْلَامِ وَتَشَدُّدَهُمْ فِي الدِّينِ أَنْ يَحْمَدَ اللهَ وَيَسْتَغْفِرَهُ» قَالَ عُمَرُ أَلَا اعْجِبُكُمْ مِنَ ابْنِ عَبَّاسٍ؟ يَا ابْنَ عَبَّاسٍ مَا لَكَ لَا تَكَلَّمُ؟ قَالَ عَلَّمَهُ مَتَى يَمُوتُ قَالَ {إِذَا جَاءَ نَصْرُ اللهِ وَالْفَتْحُ وَرَأَيْتَ النَّاسَ يَدْخُلُونَ فِي دِينِ اللهِ أَفْوَاجًا} [النصر 1] فَهِيَ آيَتُكَ مِنَ الْمَوْتِ قَالَ صَدَقْتَ وَالَّذِي نَفْسِي بِيَدِهِ مَا عَلِمْتُ مِنْهَا إِلَّا الَّذِي عَلِمْتَ