In this particular connexion, the expression is first met with in the letter of Pope Simplicius to Gaudentius, Bishop of Aufina (19 November 475); however, even then it was not new, being borrowed from profane usage.
In this specific context, the phrase first appears in a letter written by Pope Simplicius to Gaudentius, Bishop of Aufina on November 19th, 475 AD; however, even then, it was not entirely new, as it had been adopted from everyday speech.