Musannaf Ibn Abi Shaybah 8514 — The fear prayer: how many rakahs it is

Sayyiduna Abu Ayyash al-Zuraqi (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) was facing the enemy in battle at Usfan, and the polytheists were at that time led by Khalid bin al-Walid. He (peace and blessings be upon him) led his companions in the Zuhr prayer, and the polytheists said: "After this they have another prayer that is dearer to them than their wealth and their children." Then he arranged the people behind him in two rows. When he bowed, all the people bowed with him. When the people raised their heads from bowing, the row next to him prostrated while the people of the other row remained standing; when the first row raised their heads from prostration, the rear row then prostrated, on account of having bowed with the Prophet (peace and blessings be upon him). Then the front row moved back and the rear row came forward, so as to bow with the Messenger of Allah (peace and blessings be upon him). Then the front row moved back and the rear row came forward, and each of them stood in the other's place. Then he bowed, and the others remained standing; when they had finished their prostration, the others prostrated. Then the Prophet (peace and blessings be upon him) gave the salam to them all.