"And they that went in, went in male and female of all flesh, as God had commanded him: and the LORD shut him in." (Genesis 7:16)
Just as Noah and his family, along with all the types of animals, entered the Ark to be spared from God's wrath has He rained on the earth, it is crucial to note that it was the LORD who shut the door of the Ark.
It was not Noah's job to close the door.
In a sense, the LORD was the last one in, in that He puts the safety and security of His beloved first!
Now, many preachers rightly point out that this door is a type of Christ Jesus.
He Himself declared that He is the Door (John 10:9-10).
Many preachers rightly declare also that because God is the one who closed the door of the Ark, the LORD assured complete, utter, unchanging safety and security for Noah and his family.
This shutting of the door is a type to depict that once we believe in Jesus, once we declare Him our Lord and Savior, we are saved once, for all, forever!
Yet there are some who take expection to this. They believe that people can lose their salvation.
There are a number of clear responses to this error.
But let's focus on the type and shadow found in the shutting of the door.
Look at Revelation, and see how Jesus describes Himself to the church at Philadelphia in the Book of Revelation:
"These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;" (Revelation 3: 7)
Notice that Jesus closes doors that no man can open.
God the Father and Jesus are one (John 10:30). Because of this revelation, and within Revelation, we can rest assured that the same Loving God who shut the door to safeguard Noah and his family is the same God who spoke to the Church of Philadelphia.
When God shuts doors, no one can open them. When He opens doors, no one can shut them. That is His power.
Our Salvation is fully appreciated in the same fashion. When He takes us from death to life, it is eternal life (John 3:16). Nothing can separate us from His love.
The door that shuts us into Jesus, our heavenly, never-ending Ark, can never be opened again!
The door is shut, no man can open it: your salavation is secured forever in Christ Jesus!