'Joseph's sheaf,' as in Genesis 37, signifies doctrine from the Lord's divine truth, or the doctrinal ideas about the Lord's divine human. 'Sheaf' signifies doctrine, and so 'to bind sheaves' signifies teaching from doctrine. This is because 'a field' is the church, and 'standing grain in a field' denotes truth in the church, so 'a sheaf,' which contains grain, denotes doctrine which contains truth.

(References: Arcana Coelestia 4686)