Musannaf Ibn Abi Shaybah 4520 — Giving the salam in the two

Al-Sha'bi says: Sayyiduna Sa'd and Sayyiduna Ammar (may Allah be pleased with them both) prayed three rak'ahs and gave the salam. When they were told, they completed the remaining prayer, then said the takbir, then performed two prostrations, then gave the salam twice.