Possible Clues:

• Job precedes this, having first letters to be attended to with charity
• Source of the line 'Make a joyful noise unto the Lord, all ye lands'
• It's after your Job
• Bible book with 150 parts
• The Bible's longest book
• 150 followers of Job
• Whence the line 'The Lord is my shepherd; I shall not want'
• Job follower?
• Sacred songs or poems
• Songs of praise