Jehovah, the Covenant-Keeping God
LORD (small capitals) — renders the divine name Jehovah, 'I AM' or 'He who is'
And I set my face unto the Lord God, to seek by prayer and supplications, with fasting, and sackcloth, and ashes: Daniel 9:3–4
Daniel confesses Israel's sins to the LORD, the God who keeps His covenant and shows mercy. For Latter-day Saints, the LORD of the Old Testament is Jehovah, Jesus Christ before His birth.
How we know: the chapter heading names Him
