And so those who were given knowledge may know that it is the truth from your Lord and [therefore] believe in it, and their hearts humbly submit to it. And indeed is Allah the Guide of those who have believed to a straight path. - Quran Al-Hajj(The Pilgrimage) 22:54 (islam)
For them are good tidings in the worldly life and in the Hereafter. No change is there in the words of Allah. That is what is the great attainment. - Quran Yunus(Jonah) 10:64 (islam)
Indeed, it is We who sent down the Qur'an and indeed, We will be its guardian. - Quran Al-Hijr(The Rocky Tract) 15:9 (islam)
Quran Al-Kahf(The Cave) 18:27 (en en2 tfs tfs2) Recite from the Book of your Lord and none can change His Words
And recite, [O Muhammad], what has been revealed to you of the Book of your Lord. There is no changer of His words, and never will you find in other than Him a refuge. - Quran Al-Kahf(The Cave) 18:27 (islam)