Musannaf Ibn Abi Shaybah 6528 — Those who considered it recommended

Al-Abbas bin Sahl al-Sa'idi said: I lived in the time of Sayyiduna Uthman bin Affan (may Allah be pleased with him). When he gave the salam of Maghrib in the mosque, I would not see a single man praying these two rak'ahs in the mosque; they would all rush to the doors of the mosque and pray the two sunnah rak'ahs after going home.