Meaning
The entrances of the tabernacle had curtains (Ex 26:31-33, 36). The "valley of Achor" is called a "door of hope," because immediately after the execution of Achan the Lord said to Joshua, "Fear not," and from that time Joshua went forward in a career of uninterrupted conquest. Paul speaks of a "door opened" for the spread of the gospel (1Cor 16:9; 2Cor 2:12; Col 4:3). Our Lord says of himself, "I am the door" (John 10:9). John (Rev 4:1) speaks of a "door opened in heaven."