Westminster Larger Catechism

The sacraments of baptism and the Lord's supper differ, in that baptism is to be administered but once, with water, to be a sign and seal of our regeneration and ingrafting into Christ,¹¹⁴² and that even to infants;¹¹⁴³ whereas the Lord's supper is to be administered often, in the elements of bread and wine, to represent and exhibit Christ as spiritual nourishment to the soul,¹¹⁴⁴ and to confirm our continuance and growth in him,¹¹⁴⁵ and that only to such as are of years and ability to examine themselves.¹¹⁴⁶