The Qulayb at Badr

The Qulayb: a covered well in the land of Badr into which the bodies of the slain polytheists were cast after the battle, and the Prophet stood over it calling to them ¹.

When the battle ended, the polytheist dead were ordered thrown into the Qulayb; then the Prophet stood at its edge calling them by name: "O so-and-so son of so-and-so, and so-and-so son of so-and-so, were you ill tribesmen to your Prophet? Do you confirm that God fulfilled His promise to you?" ^{1 2}.

Umar asked him: do you speak to the dead, who cannot hear? He answered that they hear what he says no less than they do; the book says the address was rebuke and declaration, not a question expecting an answer ¹.