Muhammad bin Mansur bin Da'ud محمد بن منصور بن داود الطوسي · The Book of Jihad

"Whoever fights in the cause of Allah, the Mighty and Sublime, for the length of time between two milkings of a she-camel, Paradise is guaranteed for him. Whoever asks Allah to be killed (in Jihad) sincerely, from his heart, then he dies or is killed, he will have the reward of a martyr. Whoever is wounded or injured in the cause of Allah, it will come on the Day of Resurrection bleeding the most it ever bled, but its color…

"The Messenger of Allah (ﷺ) said: 'Wrap them up with their blood, for there is no wound incurred in the cause of Allah, but he will come on the Day of Resurrection bleeding with the color of blood, but its fragrance will be that of musk.'"

"There is no soul on Earth that dies, and is in a good position before Allah, that would like to come back to you, even if it had all this world, except the one who is killed (in the cause of Allah); he wishes that he could come back and be killed again."