The Book of Samuel (Hebrew: ספר שמואל, romanized: Sefer Shmuel) is a book in the Hebrew Bible, found as two books (1–2 Samuel) in the Old Testament. The book is part of the Deuteronomistic history, a series of books (Joshua, Judges, Samuel, and Kings) that constitute a theological history of the Israelites and that aim to explain God's law for Israel under the guidance of the prophets.
According to Jewish tradition, the book was written by Samuel, with additions by the prophets Gad and Nathan, who together are three prophets who had appeared within 1 Chronicles in its account of David's reign. Modern scholarly thinking posits that the entire Deuteronomistic history was composed c. 630–540 BCE by combining a number of independent texts of various ages.