Heos marks the temporal, spatial, or stated limit up to which an action, condition, or extent continues.

As a preposition or conjunction, it marks the point up to which a condition, action, journey, or period extends: remaining in Ephesus up to Pentecost, working while day lasts, traveling as far as a destination, or waiting for a stated event.

1. Marks a limiting point for time, extent, or movement · dominant

   The supplied morphology identifies the form as either a preposition or conjunction, and the clauses set a boundary for what precedes it. In 1 Corinthians 16:8 the APB renders remaining in Ephesus "until Pentecost"; in John 9:4 it renders work in relation to the coming night; in Acts 8:40 it renders Philip's proclamation through the cities up to Caesarea; and in Acts 17:15 it renders Paul's escort "as far as Athens."

   1 Corinthians 16:8John 9:4Acts 8:40Acts 17:15Luke 12:592 Peter 1:19

In the Anselm Project Bible: The APB commonly represents the boundary with "until," while also using expressions such as "as far as" and clauses describing an action continuing while a condition lasts. These English forms indicate the verse-level boundary rather than a fixed rendering of each occurrence.