The Lord their God, whom John goes before
And many of the children of Israel shall he turn to the Lord their God. Luke 1:16–17
Gabriel says John will go before 'the Lord their God.' The one John actually prepared the way for was Jesus, so Israel's God, Jehovah, is Jesus Christ come in the flesh.
How we know: the chapter heading names Him
- fulfils Malachi 3:1 — My messenger shall prepare the way before me
- fulfils Isaiah 40:3 — Prepare ye the way of the LORD
- alludes to Malachi 4:5-6 — Elijah turning the heart of the fathers to the children
- the same event in D&C 27:7 — Elias visited Zacharias and promised him a son named John
