idou is an attention-directing particle that introduces a person, event, statement, or vivid comparison for notice.

Across the supplied verses, this particle directs attention to what follows: an arriving person or present scene, a declaration or prediction, or an illustrative observation. It occurs before such clauses as the men at Peter’s gate, a coming hour, and the small rudder that turns ships.

1. Attention-directing particle before what follows · dominant

   The supplied morphology identifies the form as a particle (with Matthew 28:11 tagged Interjection), and its clauses introduce matters brought into view or emphasis. In Acts 10:17 the APB renders the arrival of Cornelius’s messengers with “behold,” while in Acts 10:19 it renders the Spirit’s announcement that men are seeking Peter with “Look”; in James 3:4 it introduces the observation about ships turned by a small rudder, and in John 16:32 it introduces the coming hour of scattering.

   Acts 10:17Acts 10:19James 3:4John 16:32Acts 7:56Matthew 28:11

In the Anselm Project Bible: The APB variously presents the particle as “behold,” “look,” and “look!” in the cited clauses. These renderings show its attention-directing effect rather than a fixed English equivalent.