Musannaf Ibn Abi Shaybah 8495 — The fear prayer: how many rakahs it is

Tha'labah bin Zahdam said: We were with Sayyiduna Sa'id bin al-As (may Allah be pleased with him) in Tabaristan, and Sayyiduna Hudhayfah (may Allah be pleased with him) was also with us. Sayyiduna Sa'id said: Which of you has prayed the fear prayer with the Messenger of Allah (peace and blessings be upon him)? Sayyiduna Hudhayfah (may Allah be pleased with him) said: I have. Then he led the people in prayer.
Sufyan said: He then mentioned (the same as) the hadith of Ibn Abbas and Zayd bin Thabit.