And He said about the people of Moses:

“My people, if you truly believe in God, then put your trust in Him, if you are indeed Muslims.”
(Qur’an 10:84)

He also said regarding Pharaoh’s sorcerers:

“They declared, ‘We believe in the Lord of all worlds—the Lord of Moses and Aaron.’ … ‘We hope our Lord will forgive us our sins, for we were the first to believe.’”
(Qur’an 26:47–48, 51)

In another verse He says:

“Our Lord, shower us with patience and cause us to die as Muslims.”
(Qur’an 7:126)

He said about Joseph, the Truthful:

“Let me die as a Muslim and join me with the righteous.”
(Qur’an 12:101)

He said concerning Bilqīs:

“My Lord, I have wronged myself, and I submit with Solomon to God, Lord of all worlds.”
(Qur’an 27:44)

He said regarding the prophets of the Children of Israel:

“We sent down the Torah containing guidance and light; by it the prophets who had submitted judged for the Jews, as did the rabbis and scholars, for they had been entrusted with the Book of God and were witnesses over it. So do not fear the people—fear Me—and do not sell My revelations for a paltry price. Whoever does not judge by what God has revealed—such people are the disbelievers.”
(Qur’an 5:44)

And He said about the disciples:

“When I inspired the disciples, ‘Believe in Me and in My Messenger,’ they said, ‘We believe; bear witness that we are Muslims … and we will be among those who bear witness to it.’”
(Qur’an 5:111–112)

Thus, all of these messengers and their nations—from Noah to the disciples—were adherents of Islam.