While I was a missionary, we were encouraged to participate in a local program with the goal of reactivating people who weren’t coming to church anymore. It was based on 3 Nephi 18:30 (in the Book of Mormon): Nevertheless, ye shall not cast him out from among you, but ye shall minister unto him and shall pray for him unto the Father, in my name; and if it so be that he repenteth and is baptized in my name, then shall ye receive him, and shall minister unto him of my flesh and blood.