The Lord Jesus calls Himself by many wonderful and tender names in the New Testament. These are some of them.
He says, "I am the Bread of Life."
He says, "I am the Light of the World."
He says, "I am the Good Shepherd."
He says, "I am the Door of the Sheep."
Perhaps this last name of Jesus is a little difficult for you to understand; but I am told that those who have visited Palestine have seen the shepherd acting as the real door of the sheep!
When night comes on, the Eastern shepherd gathers his sheep from the mountains where they have been feeding, and he leads them to a safe place, called the fold, where perhaps, shut in by rocks, or by walls, or by the sides of some steep hill with the broken rocks around as a protection, he brings them to a spot where they may rest without fear.
Then, having counted them in, and having found that all are there, he places himself across the doorway, and bids his dear flock lie down, because while he is there as their door, no harm can come to them.
This is a little picture of how it is Jesus, the Good Shepherd, can call Himself the Door of the Sheep.
I think He wanted His people—His sheep and His lambs—to understand that if He is the Door, that is their safety.