Related: I AM – YAHWEH – JEHOVAH – (Lord)
Who is “the Lord”? The Lord is not a trinity; the Lord is Jesus Christ.
Jesus or Christ declared to be Lord in the New Testament by virtue of His resurrection from the dead – Act 2:36; 10:36; Rom 10:9-13; 1 Cor 8:5-6; 12:3; 2 Cor 4:5; Eph 4:5; Phil 2:9-11; Heb 13:20; 1 Pet 3:15 (plus the many less explicit references and all the occasions where some form of the title “Lord Jesus Christ” is used)
Samples
Acts 2:36 “Therefore let all the house of Israel know for certain that God has made Him both Lord and Christ–this Jesus whom you crucified.”
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2 Cor 4:5 For we do not preach ourselves but Christ Jesus as Lord, and ourselves as your bond-servants for Jesus’ sake.
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Phil 2:9 For this reason also, God highly exalted Him, and bestowed on Him the name which is above every name,
Phil 2:10 so that at the name of Jesus EVERY KNEE WILL BOW, of those who are in heaven and on earth and under the earth,
Phil 2:11 and that every tongue will confess that Jesus Christ is Lord, to the glory of God the Father.
Is it easy enough to see Jesus Christ acknowledged as “Lord” in the New Testament. However, we must also think of Him when we read of the “Lord” in the Old Testament. Otherwise, we miss the point of what He said in the Sermon on the Mount.
Matt 5:17 “Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill.
The Old Testament presents the old covenant, but accepting Jesus as Lord makes the old covenant the new covenant. Remember that the New Testament church did not have the New Testament They just read the Old Testament in a new way – the way Jesus taught them. See 2 Cor 3 for some elaboration on this point.
The Duty of a Man 