John Lightfoot on John 20:25

[Except I shall see, &c.] They judge Moses once to have been thus weak and wavering in his faith: "When the holy blessed God said to Moses, Go down, for the people have corrupted themselves; he took the tables, and would not believe that Israel had sinned, saying, 'If I do not see, I will not believe.'"

"Thou Racha, wouldest thou not have believed if thou hadst not seen?"