Alqamah bin Qays narrates: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) prayed four rak'ahs on the day of Jumu'ah after the imam had concluded with the salam.
Al-Tabarani recorded it, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 3191