Even in your own Law it is written that the testimony of two men is valid.
17. Even in your law it is written. The argument might, at first sight, appear to be weak, because no man is received as a witness in his own cause. But we ought to remember what I have already said, that the Son of God “Le Fils de Dieu.” ought to be excluded from the ordinary number of other men, “Du nombre commun des autres...
The rest of the chapter is taken up with debates between Christ and contradicting sinners, who cavilled at the most gracious words that proceeded out of his mouth. It is not certain whether these disputes were the same day that the adulteress was discharged; it is probable they were, for the evangelist mentions no other day, and takes notice (Joh 8:2) how early Christ began that day's work.
Commenting on John 8:12-20
Then said they unto him, where is thy Father?.... The Persic version adds, "show him unto us": produce this witness boasted of, let us see him; this they said in a sneering, taunting, and insulting manner; where is thy Father? what! he is in Galilee; fetch him from thence; it is Joseph the carpenter you mean; a goodly witness indeed!