Musannaf Ibn Abi Shaybah 8497 — The fear prayer: how many rakahs it is

Sayyiduna Abdullah (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) led us in the fear prayer. The people stood in two rows: one row was formed behind the Prophet (peace and blessings be upon him), and the other row was formed facing the enemy. The Prophet (peace and blessings be upon him) led those behind him in one rak'ah. Then the second group came and stood in their place, and the group that had prayed the first rak'ah went towards the enemy. The Prophet (peace and blessings be upon him) led this group in one rak'ah and then gave the salam. These people then prayed their remaining rak'ah by themselves and gave the salam. Then they went towards the enemy, and the group that was there came, prayed their one rak'ah and gave the salam.