The Criterion - 25:27
"On that Day the wrongdoer will bite his hand and say: "If only I had followed the same path with the Messenger"."
The way of the messenger:
Prophet Joseph/12:108
"Say, "My way is this: I call to Allah with a clear proof, and so do those who follow me. Allah is Great, and I am not one who associates partners."
The Family Of Imran/3:64
"Say, "People of the Book! Come to a principle which is the same between us and you: "Let us serve none but Allah and associate with Him nothing in common, and let not one of us take the other as gods after Allah."If they refuse, say, "Bear witness, we are Muslims!"
The Thunder/13:36
"Those to whom We have given the Book rejoice at what has been sent down to you. Some groups disbelieve in part of it. Say: "I am commanded to serve Allah and to associate no partners with Him, to Him I call and to Him is my return."
The Jinn/72:20
"Say, "I call only to my Lord, and to Him I associate no partner."