Yahya related to me from Malik that Yahya ibn Said said, "The
Messenger of Allah, may Allah bless him and grant him peace, was
sitting by a grave which was being dug at Madina. A man looked into
the grave and said, 'An awful bed for the mumin. 'The Messenger of
Allah, may Allah blesshim and grant him peace, said, 'Evil? What you
have said is absolutely wrong.'
The man said, 'I didn't mean that, Messenger of Allah. I meant being killed in the way of Allah.' The Messenger of Allah, may Allah bless him and grant him peace, said, 'Being killed in the way of Allah has no like! There is no place on the earth which I would prefer my grave to be than here (meaning Madina). He repeated it three times.' "
The man said, 'I didn't mean that, Messenger of Allah. I meant being killed in the way of Allah.' The Messenger of Allah, may Allah bless him and grant him peace, said, 'Being killed in the way of Allah has no like! There is no place on the earth which I would prefer my grave to be than here (meaning Madina). He repeated it three times.' "
Muwatta Malik Book 21, Hadith 35