And know ye. — Or, and ye know.
Not with your children which have not known. — It must be remembered that all those who were less than twenty years of age at the date of the Exodus would still be living, and the events of their youth must have left a strong impression on their memories. Every man of forty-five years of age would feel the force of this address.
The chastisement. — Whether of the Egyptians in wrath, or of Israel in love.
His mighty hand.... — Or, His hand in its strength, and His arm in its length. The position of the adjectives is emphatic.