Genesis 7:20

Fifteen cubits upward did the waters prevail; and the mountains were covered.

Genesis 7:20 (KJV)

Context

This verse belongs to the account of the great flood in Genesis. God saw that human wickedness had filled the earth, so He decided to bring a flood of judgment. Yet He showed mercy by commanding Noah to build an ark and to bring his family and pairs of every kind of creature into it (Genesis 7:1-3). When they were safely inside, the fountains of the great deep burst open and the windows of heaven poured rain (Genesis 7:11). The waters rose until they covered even the highest mountains.

Meaning

The verse states that the waters prevailed fifteen cubits upward and covered the mountains. A cubit was an ancient measure, roughly the length from a person’s elbow to fingertips, about eighteen inches. Fifteen cubits would be about 22.5 feet (6.9 meters). This measurement shows that the flood was not shallow or local. The waters stood far above the mountain tops, so no land remained dry. The detail emphasizes the completeness of God’s judgment on the corrupted earth. It also shows that the flood was not a small event but a catastrophic, worldwide judgment. The precise number points to God’s deliberate and thorough action.

Biblical connections

The verse follows Genesis 7:19, which says that all the high hills under the whole heaven were covered. Together they stress the total destruction of every living thing outside the ark. Later, God made a covenant with Noah, promising never again to destroy the earth by a flood, and He set the rainbow as its sign (Genesis 9:8-17). This connection shows that the same God who judges sin also provides a way of salvation and keeps His promises. The flood narrative illustrates both divine judgment and salvation: judgment upon wickedness, and salvation for those who trusted and obeyed God’s command.

Application

The flood teaches that sin has serious consequences. God’s judgment is real and thorough, leaving no place for rebellion to hide. Yet the ark also shows that God offers a way of escape. Noah obeyed God and was saved, along with his family. In the same way, believers today find deliverance from the judgment of sin through faith in Jesus Christ, who is the true ark of salvation. This verse calls readers to trust God’s word and to obey His commands, knowing that He is both just and merciful. The flood also reminds us of God’s sovereignty over creation. He controls the waters and the earth, and He faithfully preserves His people through judgment.

Reflection

Consider the certainty of God’s promises. Just as the flood came exactly as God said, so His promises of salvation and judgment will also be fulfilled. The precise measurement of fifteen cubits reminds us that God’s actions are deliberate and reliable. It invites us to rest in His sovereignty and to live in faithful obedience, confident that He preserves those who trust in Him. The verse also calls us to reflect on the power of God’s word and the certainty of His promises, both of judgment and of salvation.