Westminster Shorter Catechism

The Lord’s Supper is a sacrament, wherein, by giving and receiving bread and wine, according to Christ’s appointment, his death is showed forth¹⁹⁷; and the worthy receivers are, not after a corporal and carnal manner, but by faith, made partakers of his body and blood, with all his benefits, to their spiritual nourishment, and growth in grace¹⁹⁸.