He founded a number of schools. Masjids were used for giving religious instructions. A number of Masjids were built by Hadrat Umar (Raziallah Anho). He asked the governors of various provinces, specially of Syria to build at least one Masjid in each city or town. In Kufa a separate Masjid was built for every clan. According to some historians he built four thousand Masjids.

The Haram (Masjid-ul-Haram) in Makkah was too small for the increasing Muslim population. He extended it and built a wall around it in order to separate it from the township. He covered the Ka'bah with very costly Egyptian cloth instead of ordinary cloth.

The Masjid of the Holy Prophet was also extended. He bought all the houses and properties surrounding the Masjid besides the houses of the chaste widows of the Holy Prophet (Sallallahu'alaihi wa Sallam), and extended the Masjid. A big platform was constructed in the yard of the Masjid to impart Islamic knowledge.

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