When we are baptized, we covenant to “stand as witnesses of God at all times and in all things, and in all places” (Mosiah 18:9).
Alma and the sons of Mosiah worked together against the Church. After an angel appeared to them, they repented. They served missions together and told everyone who would listen about the scriptures (see Mosiah 27:35).
When Emma Smith’s father wanted to know how Emma could believe in the Book of Mormon without seeing the golden plates, Emma bore her testimony.
Abish lived among Lamanites who did not believe in God. When the king and his court were converted by the power of God, Abish told her neighbors about the miracle so that they could believe in God too (see Alma 19:1–17).
Enoch told the Lord he couldn’t speak well and that no one would listen to him because he was too young (see Moses 6:31). But with the Lord’s help, Enoch was able to teach the people of Zion.