1 Peter 2:3

if ye have tasted that the Lord is gracious:

In this verse from Psalms 34, Peter applied to the Lord Jesus the great Old Testament word for God, "the Lord." The writer of Hebrews (Hebrews 6:4,5) also mentioned "tasting" as a metaphor of understanding and appropriating to one's own needs the word of God. As Mason said, "This gives quite a new complexion to the 34th Psalm,"[10] applying it as a prophecy of Jesus Christ. The Psalm is also quoted again in 1 Peter 3:10. It is also quite evident that the metaphor of Christ as the bread of life (John 6:35) lies behind the thinking of the apostle in this verse. The "if" which stands at the head of the verse, as frequently in the New Testament, "has reference to a fact, rather than to a condition."[11]

[10] A. J. Mason, Ellicott's Bible Commentary, Vol. VII (Grand Rapids, Michigan: Zondervan Publishing House, 1959), p. 400.

[11] Raymond C. Kelcy, The Letters of Peter and Jude (Austin, Texas: R. B. Sweet Company, 1972), p. 43.