Funerals (Kitab Al-Jana'iz)
Dawud :: Book 20 : Hadith 3101
Narrated Abdullah ibn Amr ibn al-'As:
The Prophet (peace_be_upon_him) said: When a man comes to visit a sick person, he should say: O Allah, cure Thy servant, who may then wreak havoc on an enemy for Thy sake, or walk at a funeral for Thy sake.