Everything, Senethro. The law has been repeated twice. By the mouth of two or three witnesses, every word shall be established.
16 But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established.
Matthew 18:16.
1 This is the third time I am coming to you. In the mouth of two or three witnesses shall every word be established.
Corinthians 13:1
28 And now, behold, I give unto you, and also unto my servant Joseph, the keys of this gift, which shall bring to light this ministry; and in the mouth of two or three witnesses shall every word be established.
D&C 6:28
3 Now, in relation to this matter, it would be very difficult for one recorder to be present at all times, and to do all the business. To obviate this difficulty, there can be a recorder appointed in each ward of the city, who is well qualified for taking accurate minutes; and let him be very particular and precise in taking the whole proceedings, certifying in his record that he saw with his eyes, and heard with his ears, giving the date, and names, and so forth, and the history of the whole transaction; naming also some three individuals that are present, if there be any present, who can at any time when called upon certify to the same, that in the mouth of two or three witnesses every word may be established.
D&C 128:3
See, the Law of Witnesses.