A new article by Ervin Budiselić does not focus heavily on the Pastorals, but I mention it here because of its obvious relevance for 1 Timothy 5:19, which is discussed on pp. 189–90. The article is available in its entirety at the address cited.
Budiselić, Ervin. “The Church as a Court: the Requirement for ‘Two or Three Witnesses.’” Kairos: Evangelical Journal of Theology 15.2 (2021): 179–94. https://doi.org/https://doi.org/10.32862/k.15.2.3
Abstract: “The Church in the New Testament is described with various images, and this article argues that one image that is implicitly present in the New Testament is the Church as a “court” or a “community of trial.” First, this can be argued because the God of the Bible – YHWH – is Creator, King, and Judge. That means that YHWH’s community is responsible, per YHWH’s revelation, to maintain the purity of its members in all aspects of life. Second, in the New Testament, we find examples where the Church functions as a court. However, the question is, does the biblical requirement for “two or three witnesses” also support the claim that the Church should function as a court? The purpose of this article is to identify places where the biblical command about “two or three witnesses appear,” to trace its development and to see what role and place it plays in the Church. By doing so, we would demonstrate that the presence of this stipulation in the New Testament is additional proof that we should sometimes view the Church as a “court.” The first part of the article explains that the context for the concept of witness is the Mosaic covenant and underlying assumption that governs the command about “two and three witnesses.” The second part analyzes the appearance of “two or three witnesses” in the Old Testament. In the third part, we will argue that the Church is truly a community of trial. We will so argue by observing selected examples from the New Testament where the Church functions as a court, and by tracking the development of the requirement about “two or three witnesses” in the New Testament. Based on this research, we will end by offering a reflection and a conclusion.”
I might mention that in addition to the literature cited in the article, one might add (though somewhat dated) an early monograph on the topic: H. van Vliet, No Single Testimony: A Study on the Adaptation of the Law of Deut. 19:15 Par. into the New Testament, Studia Theologica Rheno-Traiectina 4 (Utrecht: Kreminck en Zoon, 1958).