The one who doesn’t know to ask, you open it for him: As in "Open your mouth for the mute" (Prov. 31:8). This verse is written in Parshat Bo, "You shall tell it to your child on that day, saying, 'It is because of what the Lord did for me when I went free from Egypt.'" (Ex. 13:8) Since there is no question in this verse and only the command, "You shall tell it," it is addressed to the one who doesn’t know how to interpret the verses in the Haggadah and publicize the miracle of Passover.