Dicta Probanta
Traditionally, “proof texts” (dicta probanta) were parenthetical references or footnote/endnote references to biblical passages that undergirded some doctrinal claim made, whether in a dogmatics textbook, a catechism, or a confession of faith.
Scott Swain, Reformed Catholicity: The Promise of Retrieval for Theology and Biblical Interpretation (Grand Rapids, MI: Baker Academic, 2015), 120