Muslim bin Iyad narrates: I asked Sayyiduna Imam Hasan bin Ali (may Allah be pleased with them both) about the two rak'ahs of Jumu'ah. He said: These two make up for what is besides them (that is, they make up for any shortcoming that remained in the other prayers).
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 3165