Ibn `Abbas and Abu Hurayrah narrated that Allah's Messenger used to recite Surat Al-Jumu`ah and Surat Al-Munafiqin during the Friday Prayer. Muslim collected this Hadith in his Sahih.
﴿بِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِ ﴾
In the Name of Allah, the Most Gracious, the Most Merciful.