Musannaf Ibn Abi Shayba 11:41

Bishr ibn al-Mufaddal narrated to us, from 'Umarah ibn Abi Hafsah, from Dhu Hajar al-Yahmadi, from Sa'id ibn Jubayr regarding the saying of Allah, the Exalted: "And those in the heavens and those on the earth will swoon, except whom Allah wills." He said: They are the martyrs, in the presence of Allah around the Throne, girded with swords.