This document, a decree from the Sacred Congregation for Divine Worship, outlines the rules and regulations for Holy Communion and the worship of the Eucharist outside of Mass. It emphasizes the Eucharist's central role in Christian life, clarifying the purposes of Eucharistic reservation—primarily for the sick and the aged, but also for adoration. The decree details appropriate rites, including processions and congresses, and provides instructions for ministers and the faithful regarding proper reverence and preparation. Specific guidance is given on the location of the reserved sacrament, the celebration of Mass in relation to exposition, and the timing and manner of Communion outside Mass. Finally, it offers practical pastoral points to consider when planning Eucharistic devotions.