There are a number of biblical texts that have been rejected by scholars as later additions to the text. This seems to be a legitimate attitude when there is a strong basis for it, such as that the passage is missing from the earliest manuscripts. It's also personally convenient if the passage is theologically controversial or politically incorrect, such as Paul's supposed writings against women speaking in church, or the famous Johannine Comma.
But what if it is a beloved scripture, such as the story of the Woman Taken in Adultery, which apparently does not start appearing into relatively late in the manuscript tradition. Or, in the case of 1 Cor. 13, what if one becomes convinced that it is not actually a writing of Paul but that a later editor has inserted it. (See this question for details.) Does the fact that a beloved scripture was not part of the original text mean that it is not holy scripture?