It is narrated that Abdullah ibn Mas’ud said: “Be with the jama’ah for Allah’s hand is with the jama’ah.” Explaining this term, he also said: “The jama’ah is what adheres to the truth, even if you are alone.”  Whenever the word jama’ah is mentioned it implies following The Qur’an and Sunnah even if the number of those who adhere to it is small, and the number of those who do not is greater.

Uthman ibn Affan reported: The Messenger of Allah, peace and blessings be upon him, said, “Whoever builds a mosque for Allah, Allah will build for him a house like it in Paradise.”

Source: Ṣaḥīḥ al-Bukhārī 439, Ṣaḥīḥ Muslim 533