Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Abdul Malik (may Allah be pleased with him) that a person named Sabeeh said: Hazrat Ali (may Allah be pleased with him) was an experienced man, he used to say that war is the name of secret strategy. He used to say that he reached the rock and said, "Allahu Akbar, Allah and His Messenger ﷺ have spoken the truth, it is a rock." The narrator says that we saw that there was what was said to be like me. Then he reached the Tigris and said, "Tigris, Allahu Akbar, Allah and His Messenger ﷺ have spoken the truth." We saw that there was a thing as it was said to be.