From Sahih Muslim (Hadith 2021):
Jabir b. 'Abdullah reported that a person came (in the Mosque) while the Messenger of Allah (ﷺ) was delivering the sermon on Friday (standing) on the pulpit. He (the Holy Prophet) said to him:Have you offered two rak'ahs? He said: No. Upon this he said: Then observe (them)
Reference: Muslim 2021