Sheikh Abdulaziz bin Abdullah Al Alsheikh, Grand Mufti of the Kingdom of Saudi Arabia and President of Senior Ulema Commission, Department of Scientific Research and Ifta, highlighted the importance of the sermon of Fridays' prayers. The sheikh's remarks came in his book titled "Advice to Preachers" in which he underlined the significance of the sermon of Fridays' prayers in explaining the dangers facing the nation including deviant thoughts. He called for dealing with terrorist thought in view of the Holy Quran and Sunnah in preachers' speeches from time to time to caution people against deviation.