2141 The title of the Angel Gabriel, through whom the revelation came down. 2142 The People of the Book, if they had true faith, were themselves strengthened in their faith and cleared of their doubts and difficulties by the revelations brought by Al Mustafa: and all whether People of the Book or not-who came within the fold of Islam, found the Qur'an a Guide and a Gospel, i.e., a substitute for the Mosaic Law and for the Christian Gospel, which had both been corrupted.