Exodus 12:24

24.And ye shall observe this thing. He again repeats the precept as to its annual celebration, and expressly says, that, when they have come into the land, the recollection of their deliverance is yearly to be revived by this rite. He adds, however, what he had not before touched upon, that they should also teach their children, since, without the aid of this teaching, it would have been an unmeaning and useless spectacle. For doctrine may justly be called the life of sacraments, without which no rigor remains in them, so far are they from imparting to us any life. Lest, then, the passover should be a lifeless ceremony, God in this place enjoins that it shall not be mute; for in these words, “when your children shall say unto you,” Moses does not mean that they are to wait until their children make inquiry of their own accord, and anticipate the zeal of their parents; but he only indicates the age when they are capable of being taught. Yet, at the same time, he indirectly exhorts the children to teachableness, when their age admits of their understanding what the passover signifies, and enjoins them diligently to inquire into the use of the ceremony; that thus religion may be handed down, and may ever flourish amongst the people. Since, then, the Paschal Lamb corresponds with the Holy Supper, we may gather from hence, that none can be duly admitted to receive it, but those who are capable of being taught.