That the Messenger of Allah ﷺ said that Jibra'il had indeed descended upon him to say to him: "Tell them - meaning your Companions - to choose regarding the captives of Badr, between either killing them or ransoming the, so that the amount killed by them will correspond similarly to them." So they said: "Ranson, even though some of us may be killed." There are narrations on this topic from Ibn Mas'ud, Anas, Abu Barzah, and Jubair bin Mut'im.

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِنَّ جِبْرَائِيلَ هَبَطَ عَلَيْهِ فَقَالَ لَهُ خَيِّرْهُمْ يَعْنِي أَصْحَابَكَ فِي أُسَارَى بَدْرٍ الْقَتْلَ أَوِ الْفِدَاءَ عَلَى أَنْ يُقْتَلَ مِنْهُمْ قَابِلاً مِثْلُهُمْ قَالُوا الْفِدَاءَ وَيُقْتَلَ مِنَّا قَالَ وَفِي الْبَابِ عَنِ ابْنِ مَسْعُودٍ وَأَنَسٍ وَأَبِي بَرْزَةَ وَجُبَيْرِ بْنِ مُطْعِمٍ

[AI] "Gabrielﷺ descended upon him ﷺ and said to him: 'Inform his companions ﷺ about the captives and give them the choice of either killing them or accepting ransom for their release. However, they will have to wait until the following year to decide their fate.'" They replied, 'We prefer accepting the ransom and allowing some of us to be killed.'"

أَنَّ جِبْرِيلَ عَلَيْهِ السَّلَامُ هَبَطَ عَلَيْهِ ﷺ فَقَالَ لَهُ «خَيِّرْهُمْ يَعْنِي أَصْحَابَهُ ﷺ فِي الْأُسَارَى إِنْ شَاءُوا الْقَتْلَ وَإِنْ شَاءُوا الْفِدَاءَ عَلَى أَنْ يُقْتَلَ الْعَامَ الْمُقْبِلَ مِنْهُمْ عِدَّتُهُمْ» قَالُوا «الْفِدَاءُ وَيُقْتَلُ مِنَّا عِدَّتُهُمْ»

[AI] Jibreel came to the Prophet ﷺ on the day of Badr and said, "Give your companions the choice regarding the prisoners. If they wish, they can demand ransom, and if they wish, they can put them to death. If you agree to accept ransom, a number of them would be set free." The Prophet's companions said, "We will not agree to ransom. We will put them to death instead." (Narrated by Mahmoud ibn Ghailan, from Abu Dawud Al-Haffari)

جَاءَ جِبْرِيلُ يَوْمَ بَدْرٍ إِلَى النَّبِيِّ ﷺ فَقَالَ خَيِّرْ أَصْحَابَكَ فِي الْأُسَارَى إِنْ شَاءُوا فِي الْقَتْلِ وَإِنْ شَاءُوا فِي الْفِدَاءِ عَلَى أَنْ يُقْتَلَ عَامًا مُقْبِلًا مَثَلُهُمْ مِنْهُمٍ فَقَالُوا «الْفِدَاءُ وَيُقْتَلُ مِنَّا» 8609 وَعَنْ مَحْمُودِ بْنِ غَيْلَانَ عَنْ أَبِي دَاوُدَ الْحَفْرِيِّ بِهِ