Exodus 12:26 in the King James Version
And it shall come to pass, when your children shall say unto you, What mean ye by this service?
Context
25 It shall happen when you have come to the land which the LORD will give you, as he has promised, that you shall keep this service.
26 It will happen, when your children ask you, ‘What do you mean by this service?’
27 that you shall say, ‘It is the sacrifice of the LORD’s Passover, who passed over the houses of the children of Israel in Egypt, when he struck the Egyptians, and spared our houses.’” The people bowed their heads and worshiped.