Hadith 1588
Sayyiduna Abdullah Muzani (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) used to perform two rak‘ahs before Maghrib. Then he said: "You people should also perform two rak‘ahs before Maghrib." Then, for the third time, he said: (This command is for the one) who wishes to perform these two rak‘ahs. The Prophet (peace and blessings be upon him) feared that people might consider it as a Sunnah.