Now put your hand into your pocket: it will come out shining white without any harm to you – whenever you feel afraid, draw your hand towards yourself to ward off fear – these are two proofs from your Lord to Pharaoh and his chiefs, surely they are wicked people.”
Meaning:-
Ward: guard; protect.
Credential: a qualification, achievement, personal quality, or aspect of a person’s background,
Wicked: evil or morally wrong, sinful.