The Nine Biblical Ode (Canticles)

which are chanted at Matins

Originally, these Canticles were chanted in their entirety every day, with a short refrain inserted between each verse. Eventually, short verses (troparia) were composed to replace these refrains, a process traditionally inaugurated by Saint Andrew of Crete. Gradually over the centuries, the verses of the Biblical Canticles were omitted (except for the Magnificat) and only the composed troparia were read, linked to the original canticles by an Irmos. During Great Lent however, the original Biblical Canticles are still read.

Another Biblical Canticle, the Nunc Dimittis (Luke 2:29-32), is either read or sung at Vespers.