If you read the instructions to Noah, they were very specific. One of the instructions was in Genesis 6:16 where God told Noah to have a door on the side of the ark. One door. This door, this single door, was the only door to pass through to escape the judgment of God.
From this door we see two great things. First, Noah and his family by faith had to enter through the door. This demonstrates man’s responsibility. The second thing we see is God shutting the door. God alone could shut the door so Noah and his family could escape judgment. When God shut the door no one else could enter.
Salvation. We see it here with Noah and his family. We see how God spares them all and keeps them safe and secure in the ark. He shuts them in. This same salvation is offered to each of us. We too have only one door, one gate. Remember, Jesus said, “I am the gate for the sheep” (John 10:7 NIV). He continued, “Whoever enters through Me will be saved” (v. 9 NIV). When we enter His gate, when we give our life to Him, He promises that “no one can snatch [us] from the Father’s hand” (John 10:29 NLT). Safe. Secure. Salvation.
“And those that entered, male and female of all flesh, went in as God had commanded him. And the LORD shut him in.” – Genesis 7:16 [ESV]