If the Khatib becomes ill during the Friday Khutbah, and He misses the Prayer
Question:
The Imam of a people was delivering a sermon to them on Friday, then he became ill during the second Khutbah, so he descended after completing the sermon and was unable to stand due to the severity of the illness which had afflicted him. After the prayer was over, he recovered from the illness that had stricken him. Should he then make up for the Friday prayer, or Zuhr, since he was aware of the time and it had not elapsed?
Answer:
Whoever did not catch one Rakah of the prayer with the Imam, should pray it as Zuhr, based upon the words of the Prophet (sallallaahu alaihi wa sallam): Whoever caught a Rakah of prayer with the Imam has caught the prayer. This was narrated by Al-Athram ... and this person did not pray with the Imam at all, so he should offer it as Zuhr.
Source:
Shaykh `Abdul-`Azeez Bin Baz
Fatawa Islamiyah Vol. 2 Page 444