《便西拉智训》，或称《西拉书》，天主教译作《德训篇》，是基督新教次经的一部份，成书期大约在公元前180年到前175年间。它属于天主教，英国国教和东正教《旧约圣经》的一部份，但不包括在新教的《旧约圣经》里，在犹太人的重要经典《塔木德》及其他拉比文学里，它被引用过几次。这篇书在公元后与其他次经一同被收录在希腊语的七十士译本中，并被天主教及东正教接纳为正典的一部份。不过，大多数新教教会都拒绝接纳本书篇为正典。

The Book of the All-Virtuous Wisdom of Joshua ben Sira /ˈsaɪræk/, commonly called the Wisdom of Sirach or simply Sirach, and also known as the Book of Ecclesiasticus /ᵻˌkliːziˈæstɪkəs/ (abbreviated Ecclus.) or Ben Sira, is a work of ethical teachings from approximately 200 to 175 BCE written by the Jewish scribe Shimon ben Yeshua ben Eliezer ben Sira of Jerusalem, on the inspiration of his father Joshua son of Sirach, sometimes called Jesus son of Sirach or Yeshua Ben Eliezer Ben Sira.