Psalter (from Greek psaltḗrion, “stringed instument”) is the caption some codices give the Book of Psalms (Greek psalmoí, “songs accompanied by a stringed instrument,” e.g. Luke 20:42), the collection of 150 (or 151) poems (hymns, prayers) of the OT (Hebrew sefer tehillim, “Book of Praises”), already thought in the pre-Christian period to have been written by King David. In the Hebrew Bible, it belongs to the third divison of t…