Luke, the writer of Acts, recorded in Acts 28:23 that Paul used “the Law of Moses” and “the Prophets” to tell others about Jesus. Sometimes, it can still be helpful to use the Old Testament today when sharing the gospel, particularly with religious groups who value the Old Testament but not the New.
Here are some excellent verses from the Old Testament to explain various points of the gospel message.
We are all sinners.
“. . . there is no one who does not sin” (1 Kings 8:46).
“Every one of them has turned aside; they have together become corrupt; there is none who does good, no, not one” (Ps. 53:3).
“For there is not a just man on earth who does good and does not sin” (Eccl. 7:20).
The penalty of sin is death.
“But every one shall die for his own iniquity” (Jer. 31:30).
“There is a way that seems right to a man, but its end is the way of death” (Prov. 14:12).
“Behold, all souls are Mine; the soul of the father as well as the soul of the son is Mine; the soul who sins shall die” (Ezek. 18:4).
Jesus (the Messiah) died for you and rose again.
"But He was wounded for our transgressions, He was bruised for our iniquities; the chastisement for our peace was upon Him, and by His stripes we are healed. All we like sheep have gone astray; we have turned, every one, to his own way; and the LORD has laid on Him the iniquity of us all” (Isa. 53:5–6).
“For the transgressions of My people He was stricken. . .” (Isa. 53:8).
“He poured out His soul unto death, and He was numbered with the transgressors, and He bore the sin of many, and made intercession for the transgressors” (Isa. 53:12).
“For You will not leave my soul in Sheol, nor will You allow Your Holy One to see corruption” (Psalm 16:10).
We are saved through faith.
“And he believed in the LORD, and He accounted it to him for righteousness” (Gen. 15:6).
“Into Your hand I commit my spirit; You have redeemed me, O LORD God of truth. I have hated those who regard useless idols; but I trust in the LORD” (Ps. 31:5–6).
We are not saved by works.
"But we are all like an unclean thing, and all our righteousnesses are like filthy rags" (Isa. 64:6).