Where we are
Moroni 4 preserves the sacrament prayer on the bread, and it is one of the most precious chapters in the Book of Mormon for a simple reason: it is prayed, almost verbatim, in Latter-day Saint congregations every week. Moroni, gathering the ordinances of the church in his final chapters, records the manner of their elders and priests administering the flesh and blood of Christ unto the church (v. 1), and gives the exact words of the prayer over the bread. The chapter is brief — three verses — but it holds a covenant of extraordinary depth. In the space of one sentence, the prayer names the act (eating in remembrance of Christ's body), the threefold covenant the partaker makes (to take Christ's name, always remember him, keep his commandments), and the promise that seals it (that they may always have his Spirit to be with them). It is the renewal of the baptismal covenant, offered weekly, in the simplest and most enduring words.
The chapter's three verses give the setting and the prayer: the elders administered the sacrament according to the commandments of Christ (v. 1); they kneel down with the church, and pray to the Father in the name of Christ (v. 2); and they pray the words — that God would bless and sanctify this bread to the souls of all those who partake of it; that they may eat in remembrance of the body of thy Son, and witness... that they are willing to take upon them the name of thy Son, and always remember him, and keep his commandments... that they may always have his Spirit to be with them (v. 3).
The verse that carries the chapter is verse 3, the prayer itself — and within it, the threefold covenant (willing to take upon them the name of thy Son, and always remember him, and keep his commandments) and the sealing promise (that they may always have his Spirit to be with them). The chapter exists to preserve the sacrament prayer on the bread — the weekly renewal of the covenant of discipleship — exactly as Christ commanded it, so that the future church might covenant with God in the same words and receive the same promise.
The prayer on the bread (verses 1–3)
O God, the Eternal Father, we ask thee in the name of thy Son, Jesus Christ, to bless and sanctify this bread to the souls of all those who partake of it; that they may eat in remembrance of the body of thy Son. — Moroni 4:3
The prayer is addressed to God, the Eternal Father, and offered in the name of thy Son, Jesus Christ — the same pattern as every ordinance Moroni has preserved. The request is that God bless and sanctify this bread to the souls of all those who partake — not to their bodies but to their souls, for the sacrament is a spiritual nourishment, the bread made holy to feed the soul. And the purpose of eating is in remembrance of the body of thy Son. The bread is a remembrance — the broken body of Christ, given for us, called to mind in the eating. This is the heart of the sacrament: not a magical transformation but a holy remembering, the partaker eating the bread while remembering the body that was broken. The risen Lord himself instituted it among the Nephites (3 Nephi 18) as he had at Jerusalem, this do in remembrance of me (Luke 22:19). Moroni preserves the prayer so that the remembering would continue — that a future people would eat the bread and remember the body of Christ, week after week, until he comes.
...and witness unto thee, O God, the Eternal Father, that they are willing to take upon them the name of thy Son, and always remember him, and keep his commandments which he hath given them, that they may always have his Spirit to be with them. — Moroni 4:3
The second half of the prayer is the covenant, and it is threefold. To partake is to witness — to testify before God — three things: willing to take upon them the name of thy Son, always remember him, and keep his commandments. This is the renewal of the baptismal covenant (Mosiah 18:8–10), the same promises made at the waters of Mormon, now renewed at the sacrament table. To take Christ's name is to belong to him, to be called by his name as his own. To always remember him is the antidote to the forgetting that destroyed the Jaredites and the Nephites. To keep his commandments is the active obedience of the disciple. And the prayer names the promise that seals the covenant: that they may always have his Spirit to be with them. This is the sacrament's great gift — the constant companionship of the Spirit, the very thing the Nephites lost when wickedness drove it out (Mormon 1:14). The covenant is reciprocal: the partaker witnesses the three promises, and God grants the Spirit's continual presence. The word always appears twice — always remember him, always have his Spirit — binding the two: those who always remember are those who always have the Spirit. The sacrament is the weekly renewal of the whole life of discipleship, offered in a single sentence over a piece of bread.
How the chapter is built
Moroni 4 is built as a preserved liturgy, and its structure is the structure of the ordinance itself: setting, posture, prayer. The elders administer according to the commandments of Christ (v. 1); they kneel down with the church (v. 2); and they pray the exact words (v. 3). The architecture is documentary and reverent — Moroni preserves not only the words but the manner (kneeling, with the church), so that the future church could administer the sacrament exactly as Christ commanded. The brevity is fidelity: the prayer is short because the ordinance is simple, and Moroni's task is to preserve it whole and unaltered, which is precisely why Latter-day Saints can pray it today almost word for word.
The chapter is also built around the single sentence of the prayer, which is itself a complete theology of the sacrament. In one sentence it holds the act (eating in remembrance of the body), the threefold covenant (take the name, always remember, keep the commandments), and the promise (always have his Spirit). The architecture compresses the whole meaning of the ordinance into a single, balanced petition — remembrance, covenant, promise — so that nothing essential is missing and nothing superfluous is added. The structure of the prayer mirrors the structure of discipleship: remember Christ, covenant with him, receive his Spirit. Moroni preserves this perfect compression so that the weekly renewal of the covenant would be complete in itself, the whole life of a disciple gathered into one prayer over bread.
And the chapter is built to bind remembrance to the Spirit through the repeated word always. The partaker covenants to always remember him, and the promise is that they may always have his Spirit to be with them. The architecture links the two by the shared word: constant remembrance and constant companionship of the Spirit are the same reality, the one producing the other. This is the chapter's deepest teaching — that the Spirit abides with those who remember Christ, and that the sacrament is the weekly act by which remembrance, and so the Spirit, is renewed. Against the forgetting that destroyed two civilizations in the Book of Mormon, Moroni preserves the ordinance of always remembering — the bread of remembrance that keeps the Spirit always near.