Quran 3: 65-68
O People of the Book (Scriptures), why do you argue about Ibrahim (Abraham) while the Torah and the Gospel were not revealed until after him? Do you not reason? (
65)
You are those who have argued about that of which you have (some) knowledge. Why do you argue about that of which you have no knowledge? And Allah knows, while you do not know. (
66)
Ibrahim was neither a Jew nor a Nazarethan (Christian), but he was a 'haneef (one inclining toward truth), a Muslim (submitting to Allah). And he was not of the polytheists. (
67)
Indeed, the most worthy of belonging to Ibrahim among the people are those who followed him (in submission to Allah) and this Prophet (Muhammed), and those who believe (in his Message). And Allah is the patron of the believers. (
68)
(Al-'Imran, 3: 65-68).