The one who asked (the Prophet) was Gabriel (refer to Hadith 5.327).
Sahih al-Bukhari Book 64, Hadith 45
← Previous Hadith Rifa`a was one of the warriors of Badr while (his father) Rafi` was one of the people of Al-`Aqaba (i.e. those who gave the pledge of allegiance at Al-`Aqaba). Rafi` used to say to his son, "I would not have been happier if I had taken part in the Badr battle instead of taking part in the 'Aqaba pledge."

Sahih al-Bukhari Book 64, Hadith 44 Next Hadith → The Prophet (ﷺ) said on the day (of the battle) of Badr, "This is Gabriel holding the head of his horse and equipped with arms for the battle.

Sahih al-Bukhari Book 64, Hadith 46