Psalm 26
Psalm 26, the 26th psalm of the Book of Psalms in the Bible, begins: "Judge me, O LORD; for I have walked in mine integrity".
The Book of Psalms is part of the third section of the Hebrew Bible, and a book of the Christian Old Testament. Wikipedia
Book: Book of Psalms
Christian Bible part: Old Testament
Hebrew Bible part: Ketuvim
Order in the Christian part: 19
Order in the Hebrew part: 1