Musannaf Ibn Abi Shaybah 8710 — One who catches one rakah of Maghrib

Ibrahim said: Jundub and Masruq once set out intending to pray Maghrib, and both of them caught one rak'ah of Maghrib with the imam. When the imam gave the salam, while completing the rest of his prayer Masruq sat after the second rak'ah, whereas Jundub did not sit. In the rak'ah they had caught with the imam, Jundub recited, but Masruq did not recite. What the two of them had done was mentioned before Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), and he said: Both of you did well, but I would do what Masruq did.