In Orthodox Christian worship, the prayer is the basis of the seventh and eighth biblical canticles sung at Orthros. Although the text of the canticles are generally not read in contemporary practice, the hymns sung as part of the canon reference the theme of the Three Holy Children. At Vespers of Holy Saturday, the text of the prayer is heard as part of one of the fifteen Old Testament readings prescribed for that day. In Byzantine practice, the closing refrains to each verse "bless ye the Lord: praise and exalt him above all for ever" are chanted elaborately.