When is the deceased questioned in his grave? And what happens if his burial is delayed, or if he is buried with other deceased individuals in groups? And are non-Muslims questioned in their graves?

The questioning of the deceased in the grave is a reality, and there are legal texts that confirm this, such as the Hadith in Al-Bukhari which mentions the questioning of the two angels to the deceased after burial and the deceased hearing the footsteps of his companions. The questioning in the grave is generally understood to be the norm, so whoever is not buried will undoubtedly be questioned. Nothing in Islamic law is rationally impossible; rather, it contains matters that bewilder minds, and the texts guide the intellect in matters of the unseen. The questioning will be for the believer, the hypocrite, and the disbeliever.