Praying in the Pathways Adjoining the Masjid
Question: What is the ruling regarding the one who prays outside the masjid, such as the one who prays in the pathways adjoining the masjid?
Response: If the masjid is not large enough for the congregation and (some of them) they prayed in the adjoining pathways (to the masjid) then there is no harm (in that) so long as they are able to follow the imaam because that is necessary.
Shaykh Ibn 'Uthaymeen
Majmoo' Fataawa wa Rasaa.il Muhammad ibn Saalih al-'Uthaymeen - Volume 13, Fatwa No.398