2 verses have
Once
in Edition Clear Qur'an by Talal Itani / Al-Qasas (The Stories)

28:15Once he entered the city, unnoticed by its people. He found in it two men fighting—one of his own sect, and one from his enemies. The one of his sect solicited his assistance against the one from his enemies; so Moses punched him, and put an end to him. He said, “This is of Satan's doing; he is an enemy that openly misleads.”

28:69And your Lord knows what their hearts conceal, and what they reveal.