Quran 7:2 Al-A'raf, ayah 2 of 206

كِتَـٰبٌ أُنزِلَ إِلَيْكَ فَلَا يَكُن فِى صَدْرِكَ حَرَجٌ مِّنْهُ لِتُنذِرَ بِهِۦ وَذِكْرَىٰ لِلْمُؤْمِنِينَ ۝٢

7:2 (It is) a Scripture that is revealed unto thee (Muhammad) - so let there be no heaviness in thy heart therefrom - that thou mayst warn thereby, and (it is) a Reminder unto believers.