It's the Benedicite (http://en.wikipedia.org/wiki/Benedicite), the 32nd and last verse being, in the BCP version, "O Ananias, Azarias and Misael, bless ye the Lord : praise him, and magnify him for ever." The whole thing is from the Greek (I think) version of Daniel 3, but isn't in the Hebrew, so it's relegated to the apocrypha in protestant bibles.