Almighty Allah says in the Holy Qur'an:
“The Likeness of those who spend their wealth in the Way of Allah is as the likeness of a grain of corn: It grows seven ears, and each ear has a hundred grains. And Allah gives manifold increase to whomever He wants. And Allah cares for all and He knows all things.”
The Holy Qur'an 2:261
The Messenger of Allah, Muhammad – Sal Allaahu Alayhi wa Sallam – Said:
“Whoever builds a Mosque, seeking the pleasure of ALLAH, ALLAH shall build a house for him in Paradise.”
Sahih Bukhari