If a person is praying two rak’ahs on Friday (at Jumu’ah) then the imaam comes in, should he stop praying or not?


Praise
be to Allaah.  

It seems to me, and Allaah knows best, that if you have
already prayed one rak’ah with its two prostrations, then you should
complete your prayer quickly, because of the hadeeth of Abu Hurayrah
(may Allaah be pleased with him), that the Prophet

(peace and blessings of Allaah be upon him) said: “Whoever catches up
with one rak’ah of the prayer has caught up with the prayer.” (Agreed
upon). 

But if the khateeb starts his khutbah before you have
completed the first rak’ah with its two prostrations, then you should
stop your prayer, because of the obligation to listen to the khateeb.