In the passage for 1 John 5:21
QUESTION—What is the significance of the article before εἰδώλων ‘idols’?
It indicates that a specific danger is in mind [AB, TNTC, Ws].
The TNTC does not contain a link to the resource. In fact, checking random similar links, it seems that none of the TNTC links to the resource. The other links to resources function even for resopurces which i do not own, but for TNTC there is no link.