This signifies the goods and truths of the natural in man. (Arcana Coelestia 7921)

7921. 'And strike the lintel and the two doorposts' means the forms of good and the truths of the natural. This is clear from the meaning of 'the lintel' as the good of the natural, and from the meaning of 'the doorposts' as the truths of it, dealt with in 7847.