A testimony that things are true

1. Mosiah 8: 9
     9 And for a testimony that the things that they had said are true they have brought twenty-four plates which are filled with engravings, and they are of pure gold.
2. Alma 30: 41
     41 But, behold, I have all things as a testimony that these things are true; and ye also have all things as a testimony unto you that they are true; and will ye deny them? Believest thou that these things are true?