Mosiah 6

 Mormon explains - 

"...king Benjamin thought it was expedient, after having finished speaking to the people, that he should take the names of all those who had entered into a covenant with God to keep his commandments."  (Mosiah 6:1)

Moroni later explains -

"...after they had been received unto baptism, and were wrought upon and cleansed by the power of the Holy Ghost, they were numbered among the people of the church of Christ; and their names were taken, that they might be remembered and nourished by the good word of God, to keep them in the right way, to keep them continually watchful unto prayer, relying alone upon the merits of Christ, who was the author and the finisher of their faith."  (Moroni 6:4)

Records are important in the Church of Jesus Christ.