(3d) If both words or word clusters are determined by the article, the first one is the subject. The interesting rule for my purposes is (3c). McGaughy says that after checking every occurrence of ἐστίν in the NT, he finds that all of them fit under one of these descriptive “rules,” except for five exceptions to (3c), viz., John 20:31; 1 John 2:22b; 4:15; 5:1; 5:5c. In each of these instances, a christological statement is being made; and in each instance McGaughy says that the anarthrous “Jesus”
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