Jesus Christ — the Lord Speaking
Behold, verily, thus saith the Lord unto you: In consequence of evils and designs which do and will exist in the hearts of conspiring men in the last days, I have warned you, and forewarn you, by giving unto you this word of wisdom by revelation— Doctrine and Covenants 89:4
The Lord who gives the Word of Wisdom is Jesus Christ. He foresaw the schemes of conspiring men in the last days and warned His Saints ahead of time.
