Musnad Ahmad 462:12

Ishaq ibn Isa and al-Hakam ibn Nafi narrated to us, they said: Ismail ibn Ayyash narrated to us, from Buhayr ibn Sa’d, from Khalid ibn Ma’dan, from al-Miqdam ibn Ma’di Karib al-Kindi, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, for the martyr with Allah, the Almighty and Majestic—al-Hakam said: six qualities—is that he is forgiven at the first gush of his blood, and he sees—al-Hakam said: and he sees—his seat in Paradise, and he is adorned with the garment of faith, and he is married to the wide-eyed houris, and he is protected from the punishment of the grave, and he is secure from the greatest terror—al-Hakam said: the day of the greatest terror. And there is placed upon his head the crown of dignity, a single ruby of which is better than the world and what is in it, and he is married to seventy-two wives from the wide-eyed houris, and he is granted the right of intercession for seventy people of his relatives."