It starts with 'Domine labia mea aperies; et os meum annuntiabit lauden tuam' (O Lord open my lips, that I may announce your praise', said three times while making a sign of the cross on your lips.
Then Psalm 3 (uniquely to the Monastic Office) is said.
Then Psalm 94, interspersed with the antiphon of the day, season or feast (there is a slightly complicated pattern to the interspersing which you can get by looking at Office for the Dead in the Farnborough Diurnal, the Little Office of Our Lady, or a Roman version of the Office).
Then the hymn of the day, season or feast.
Both the antiphon and hymn are generally (though not always) the same as in the Roman Office, so you can find them here (note this link, I'll refer to it again. And make sure you specify 1962 rubrics for this purpose, assuming that is what you are saying otherwise).
Monastic Matins, like Matins in the Roman Office, is divided into 'Nocturns' - the psalms with antiphons followed by a versicle, Our Father, Absolution, and lessons each with responsory. There are significant differences between the Roman and Monastic Office here though:
- in the Monastic Office, the first two Nocturns almost invariably consist of six psalms with antiphons, compared to the Roman three;
- the Third Nocturn (used on Sundays and major feasts) consists of canticles and antiphons rather than psalms;
- the number of readings often differs between the Roman and Monastic Offices.
The conclusion of the Hour is essentially the same as for the day hours (though it can be somewhat abbreviated on Sundays where Lauds follows immediately).
Sundays and First Class Feasts
On Sundays, there are twelve lessons (each with a request for a blessing, blessing, and responsory), followed by a reading of the Gospel for the Sunday (the same as used at Mass). The normal pattern (to which there are exceptions) is as follows:
- First Nocturn - Scriptural readings
- Second Nocturn - Patristic commentary on the first nocturn readings;
- Third Nocturn - Patristic readings relating to the Gospel of the day, followed by the Te Deum, Gospel, the hymn Te Decet Laus, then the Collect.
Days of the week in (Northern Hemisphere) Summer
If the Sunday Office is much longer than the Roman, St Benedict cuts down the number of readings at least in the weekday Office during summer to allow his monks to get enough sleep (remember the night was measured by hours of darkness, so a lot shorter in summer).
So when it comes to readings all you get during this time of year for Nocturn I is a very short, set lesson which is closer to a chapter in length, though does come with an introductory request for a blessing, together with a responsory. For Monday for example, it is from Lamentations, Chapter 2, vs 19.
Nocturn II also has a chapter and versicle of the day, and variants based on the time of saint for Class III feasts.
The ferial Office in winter
In winter, Nocturn I has three readings with responsories, normally identical to those in the Roman Office, so just take it from there. You could follow the Roman pattern for summer as well if you really want to say a reading or two...
Third Class feasts
Third class feasts during summer generally have one reading, usually on the life of the saint - you can generally find these in the Roman Office. In winter, there are three, often the same as in the Roman (assuming the saint is celebrated in both calendars. There is a common of saints where no proper exists).
Second Class Feasts
Second class feasts usually have two nocturns with three three readings (typically patristic, but sometimes including something from the life of the saint) in Nocturn I, and a chapter relating to the type of saint in Nocturn II. You can generally find the Nocturn I readings in the Roman Office.