κρούω

I knock

Definition

The verb κρούω means 'to knock,' specifically to strike a door with the hand or an object to gain entry. In its literal sense, it describes the physical act of knocking on a door, as when Peter knocks at the gate in Acts 12:13. Figuratively, it is used by Jesus in the context of persistent prayer and seeking God, where knocking symbolizes a continual, earnest request for divine response and access to God's kingdom, as seen in Matthew 7:7-8 and Luke 11:9-10. In the parable of the shut door in Luke 13:25, knocking takes on a more urgent, eschatological tone, representing a plea for entry that may come too late.

Biblical Usage

κρούω is used nine times in the New Testament, primarily in the Gospels of Matthew and Luke, and once in Acts. In Matthew 7:7-8 and Luke 11:9-10, it appears in Jesus' teaching on prayer, forming a triad with 'ask' and 'seek' to encourage persistent petition. In Luke's narrative, it also describes literal knocking by a master returning home (Luke 12:36) and by those shut out of the kingdom (Luke 13:25). In Acts 12:13, 16, it is used in the historical account of Peter's miraculous escape, where Rhoda recognizes his knock at the gate.

Etymology

Derived from the Proto-Indo-European root *kreu-, meaning 'to strike.' It is a primary verb in Greek, with cognates suggesting actions of beating or striking. The meaning remained consistent in Koine Greek, focusing on the act of striking a surface, most commonly a door, to produce a sound.

Semantic Range

This word is theologically significant as it is employed by Jesus to illustrate the nature of prayer and divine-human relationship. The command to 'knock' (Matthew 7:7) emphasizes persistence, faith, and the assurance that God hears and responds. The imagery in Luke 13:25 serves as a sobering warning about the finality of judgment and the necessity of seeking God while there is still opportunity, enriching the reader's understanding of salvation, eschatology, and the character of God as both welcoming and just.

In the ancient Mediterranean world, doors and gates were significant points of security and social interaction. Knocking was a necessary and public act to request entry into a private home or walled courtyard, unlike modern doorbells. The sound identified the visitor. The scenario in Luke 12:36 reflects the cultural practice of servants staying awake to greet their master upon his return, with knocking signaling his arrival.

τυπτω (typtō, G5180) — a more general term meaning 'to strike' or 'beat,' often with violence (e.g., striking the breast in grief), whereas κρούω is almost exclusively for knocking on a door.

Word Details

Scripture References