St Omer Psalter, Mulberton/England ca 1330
London, British Library, MS Yates Thompson, Add. 39810. fol. 7
The religious Jewish songs from the Old Testament, which were usually ascribed to King David, had been developed over a longer period after the Jewish exile. Already in the early Middle Ages psalms had formed the basis of monastic devotional services.
The cited Latin text of the first psalm says: “Blessed id the man who does not follow the council of the wicked, nor walk the way of sinners, nor take a seat among the scornful; the law of the Lord is a delight, and in His law he meditates by night and day. He grows like a tree planted besides rushing streams, which yields its fruit in right season and its leaves never wither, in all he does he prospers. Not so are the wicked men, they are like chaff driven by the wind.”