Place a picture of a full-time missionary on the board. Tell the children that they will read some scriptures about missionary work.
Assign half of the children to read Matthew 28:19–20 and the other half to read Doctrine and Covenants 133:37.
Invite them to identify what they learn about missionary work from the scriptures, and discuss it with the whole Primary. Ask children who have a family member currently serving a mission to share their feelings about missionary work.

Have the children stand and sing “I Hope They Call Me on a Mission” (CS, 169). Tell the children that Heavenly Father wants the gospel to be preached in all the world and they can prepare now to be missionaries. In a container, place objects that will remind the children of ways they can prepare to serve a mission, such as scriptures, Sunday shoes, a tithing slip, and a paper heart.

Have a child choose an object from the container and share how doing what it represents can help them prepare to be missionaries.