al-Saʿdī
Al-Saʿdī explains that the Day of Decision is named so because on it Allah decisively separates the creation and judges between them, settling every dispute that divided them in this world. It has a fixed appointed time, neither early nor late, known to Allah alone. He describes the scene plainly: the trumpet is blown and people stream from their graves in successive crowds toward the place of standing; the sky splits open until it is all gateways and passages; and the towering mountains are driven along and crushed until they become like a shimmering mirage—seeming substantial yet utterly nothing.