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Riyad us Saliheenوعنه قال: كنا نصلي على عهد رسول الله صلى الله عليه وسلم ركعتين بعد غروب الشمس قبل المغرب، فقيل: أكان رسول الله صلى الله عليه وسلم صلاها؟ قال: كان يرانا نصليهما فلم يأمرنا ولم ينهنا. ((رواه مسلم))."
Anas (May Allah be pleased with him) reported:
In the lifetime of the Messenger of Allah (ﷺ), we used to perform two Rak'ah (optional prayer) after sunset before the Maghrib prayer. It was asked: "Did Messenger of Allah (ﷺ) perform them?" He replied: "He saw us performing it, but he neither ordered us to perform them nor did he forbid us from doing so."
[Muslim].
[Muslim].
Reference: Sunnah.com : Book 9, Hadith 134
Arabic/English book : Book 9, Hadith 1124
Arabic/English book : Book 9, Hadith 1124