ויאמרו החרטמם אל פרעה אצבע אלה-ים הוא… (וארא ח:טו)

The word “חרטמים” is typically spelled with the letter “י.”  By מכת כינים – the plague of lice, the word “חרטמם” is spelled without the letter “י.”  Since the sorcerers could not create the plague of lice with their magic, as it says “ולא יכלו” – they could not – therefore, the word “חרטמם” is missing the letter “י.”hrough the makkos, you will not leave empty-handed, since you will become rich.