AS-SIRATU ‘L-MUSTAQIM. الصراطالمستقيم
“The right way,” i.e. the Muslim religion e.g. Qur’an, Surah iii. 44: “Fear God and obey me; of a truth God is my Lord and your Lord: Therefore worship Him. This is the right way.” It occurs in about thirty other places.
Based on Hughes, Dictionary of Islam