King James Version of the Holy Scriptures, the verb "to kneel" occurs more than thirty times, both in the Old and in The New Testament. In front of the Blessed Sacrament Genuflection is a sign of reverence to the Blessed Sacrament. Its purpose is to allow the worshipper to engage his whole person in acknowledging the presence of and to honor Jesus Christ in the Holy Eucharist. It is customary to genuflect whenever one comes into or leaves the presence of the Blessed Sacrament reserved in the Tabernacle. "This venerable practice of genuflecting before the Blessed Sacrament, whether enclosed in the tabernacle or publicly exposed, as a sign of adoration, ...requires that it be performed in a recollected way. In order that the heart may bow before God in profound reverence, the genuflection must be neither hurried nor careless." A common-sense exception applies to a sacristan or custodian for whom it would be impractical to constantly be genuflecting in the course of their duties. Genuflection to the Blessed Sacrament, the consecrated Eucharist, especially when arriving or leaving its presence, is a practice in the Anglican Communion, the Latin Rite Catholic Church, the Lutheran Church, and the Western Rite Orthodox Church. It is a comparatively modern replacement for the profound bow of head and body that remains the supreme act of liturgical reverence in the East. Since in many Anglican, Roman Catholic and Western Orthodox Churches the Blessed Sacrament is normally present behind the altar, genuflection is usual when arriving or passing in front of the altar at the communion rail. When genuflecting, making the sign of the cross is optional. Only during the later Middle Ages, centuries after it had become customary to genuflect to persons in authority such as bishops, was genuflection to the Blessed Sacrament introduced. The practice gradually spread and became viewed as obligatory only from the end of the fifteenth century, receiving formal recognition in 1502. The raising of the consecrated Host and Chalice after the Consecration in order to show them to the people was for long unaccompanied by obligatory genuflections. The requirement that genuflection take place on both knees before the Blessed Sacrament when it is unveiled as at Expositions (but not when it is lying on the corporal during Mass) was altered in 1973 with introduction of the following rule: "Genuflection in the presence of the Blessed Sacrament, whether reserved in the tabernacle