Postquam autem venerunt ad aream Nachon, extendit Oza manum ad arcam Dei, et tenuit eam: quoniam calcitrabant boves, et declinaverunt eam. Iratusque est indignatione Dominus contra Ozam, et percussit eum super temeritate: qui mortuus est ibi iuxta arcam Dei. (From the Roman Breviary, 2nd-3rd readings of Matins for Thursday within the fifth week after the Pentecost Octave, II Kings/II Samuel vi, 6-7: "And when they came to the floor of Nachon, Oza [Uzzah] put forth his hand to the ark of God, and took hold of it: because the oxen kicked and made it lean aside. And the indignation of the Lord was enkindled against Oza, and he struck him for his rashness: and he died there before the ark of God.")
Now as to the use of this holy sacrament [the Most Holy Eucharist], our Fathers have rightly and wisely distinguished three ways of receiving it. For they have taught that some receive it sacramentally only, to wit sinners: others spiritually only, those to wit who eating in desire that heavenly bread which is set before them, are, by a lively faith which worketh by charity, made sensible of the fruit and usefulness thereof: whereas the third (class) receive it both sacramentally and spiritually, and these are they who so prove and prepare themselves beforehand, as to approach to this divine table clothed with the wedding garment. Now as to the reception of the sacrament, it was always the custom in the Church of God, that laymen should receive the communion from priests; but that priests when celebrating should communicate themselves; which custom, as coming down from an apostolical tradition, ought with justice and reason to be retained.
Sacred and Ecumenical Council of Trent
Session XIII (October 11, 1551)