Muwatta Malik, Book 5, Hadith 18 (USC-MSA)

Yahya related to me from Malik from Yahya ibn Said that he had heard that the Messenger of Allah, may Allah bless him and grant him peace, said, "There is nothing wrong in wearing two garments which are not work-clothes for jumua."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ قَالَ ‏ "‏ مَا عَلَى أَحَدِكُمْ لَوِ اتَّخَذَ ثَوْبَيْنِ لِجُمُعَتِهِ سِوَى ثَوْبَىْ مَهْنَتِهِ ‏" ‏ ‏.‏

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also referenced under: Book 5, Hadith 241 (In-Book)