This is τοῦτο, the neuter singular nominative and accusative form of the demonstrative pronoun οὗτος, meaning 'this thing' or 'this.' In Greek, where abstract concepts and neuter nouns abounded, this form saw constant use. It could refer to statements ('this saying'), events ('this thing that happened'), or abstract ideas ('this truth'). The neuter form was particularly important for referring back to entire clauses or propositions—'this that was just said.' Biblical writers used it to mark significant statements, point to miraculous signs, or indicate divine purposes. The accusative function made it essential for expressing 'I do this' or 'seeing this' in Greek syntax.