Deuteronomy 19:15

19:15 A single witness may not testify against another person for any trespass or sin that he commits. A matter may be legally established only on the testimony of two or three witnesses.

Matthew 26:59-60

26:59 The chief priests and the whole Sanhedrin were trying to find false testimony against Jesus so that they could put him to death. 26:60 But they did not find anything, though many false witnesses came forward. Finally two came forward

Acts 6:11

6:11 Then they secretly instigated some men to say, “We have heard this man speaking blasphemous words against Moses and God.”