“You shall strive for the cause of GOD as you should strive for His cause. He has chosen you and has placed no hardship on you in practicing your religion – the religion of your father Abraham…” Quran 22:78

Sahih Bukhari

Volume 1, Book 2, Number 38:

Narrated Abu Huraira:

The Prophet said, “Religion is very easy and whoever overburdens himself in his religion will not be able to continue in that way. So you should not be extremists, but try to be near to perfection and receive the good tidings that you will be rewarded; and gain strength by worshipping in the mornings, the nights.” (See Fath-ul-Bari, Page 102, Vol 1).

Sahih Bukhari

Narrated Abu Huraira:

Allah’s Apostle said: “The deeds of anyone of you will not save you.” They said, “Even you, O Allah’s Apostle?” He said, “No, even I (will not be saved) unless and until Allah bestows His Mercy on me. Therefore, do good deeds properly, sincerely and moderately, and worship Allah in the forenoon and in the afternoon and during a part of the night, and always adopt a middle, moderate, regular course whereby you will reach your target (Paradise).”

Sahih Bukhari 

Narrated by Abdullah bin Amr bin Al-As, God Told Mohammed :

You are neither hard-hearted nor of fierce character, nor one who shouts in the markets. You do not return evil for evil, but excuse and forgive. – Bukhari, Volume 6, Book 60, Number 362

Sahih Muslim

“Extremists are fanatic zealots who exceed bounds in words and deeds” and “bigots” [Imam Al-Nawawi, Sharh Sahih Muslim (16:220 and 7:214)].