What should one do if he could not hear the Jumu'ah khutbah?

Hazrat Umar says that the Friday sermon has been instituted in place of two rak‘ahs, therefore, whoever does not get the sermon should perform four rak‘ahs.

Hazrat Ata used to say that whoever misses the Friday sermon should offer four rak'ahs.

Hazrat Ata, Hazrat Tawus, and Hazrat Mujahid say that whoever misses the Friday sermon should perform four rak'ahs.

Hazrat Ata and Hazrat Tawus say that whoever misses the Friday sermon should offer four rak‘ahs.

Hazrat Mak’hool says that whoever misses the Friday sermon should perform four rak’ahs.

Hazrat Ata bin Yazeed Laithi says that whoever misses the Friday sermon should offer four rak'ahs.

Ibn Aun narrates that it was mentioned before Muhammad about the statement of the people of Makkah that whoever misses the Friday sermon should perform four units of prayer. So he said that this is not correct.

Hazrat Umar says that there were four rak'ahs for Jumu'ah, then two rak'ahs were reduced because of the sermon. So whoever misses the sermon should pray four rak'ahs.