Hadith 533
كان النبى صلى الله عليه وسلم يركع قبل الجمعة اربعا لا يفصل فى شيء منهن
"The Prophet (peace and blessings be upon him) used to perform four rak'ahs before the Friday sermon, and he would not separate them (by concluding with salam) in any of them."
