The Greek katha is a contracted form of kata ha, meaning 'just as,' 'according as,' or 'in the manner that.' It draws a comparative relationship between two statements or realities.
Katha is the grammar of correspondence and covenant. In Matthew 27:10 it appears in a fulfillment formula: 'just as (katha) the Lord commanded me.' The word performs the essential work of connecting prophecy and fulfillment, promise and reality, divine command and human obedience. It is the conjunction of 'it is written... and it happened.' Theologically, katha declares that God's word and God's world correspond — that Scripture is not abstract but maps onto history. Every 'just as' in the Bible's fulfillment language is a declaration that God keeps his word, that his commands have traction in reality, and that human history is not random but follows the contours of divine promise.