The Table Spread - 5:44 We sent down the Torah in which is guidance and light, and the Muslim prophets used to judge between the Jews by it. And the rabbis and the scribes used to judge by what they were commanded from the Book of Allah, and they were witnesses over it. Do not honor the people, honor Me, and do not sell My verses at a cheap price. Those who do not judge by what Allah has revealed are disbelievers.
All messengers brought the message of servitude/service to Allah alone and therefore all messengers are Muslims:
The Prophets/21:25 "We did not send a messenger before you except that We revealed to him, "There is no god but Me; serve Me alone."

The Cow/2:140 "Do you claim that Abraham, Ishmael, Isaac, Jacob and their descendants were Jews or Christians? Say: "Do you know better or Allah? Who is more unjust than he who conceals what Allah has revealed? Allah is not heedless of what you do."

The Family Of Imran/3:67 Abraham was neither a Jew nor a Christian; he was a monotheistic Muslim. He was never of those who associate partners.