Isa 52:7, Isa 61:1-4, Lk 4:16-21, Jn 3:16, Jn 20:31
In the Old Testament, Isaiah praised God for doing the most beautiful thing, the work of saving us. (Isa 12:2-5)
Isa 12:2 Behold, God is my salvation; I will trust, and not be afraid: for the Lord Jehovah is my strength and my song; he also is become my salvation. 3 Therefore with joy shall ye draw water out of the wells of salvation. 4 And in that day shall ye say, Praise the Lord, call upon his name, declare his doings among the people, make mention that his name is exalted. 5 Sing unto the Lord; for he hath done excellent things: this is known in all the earth.
In the Old Testament, Isaiah reveals that the good news is that God saves us. (Isa 52:7)
Isa 52:7 How beautiful upon the mountains are the feet of him that bringeth good tidings, that publisheth peace; that bringeth good tidings of good, that publisheth salvation; that saith unto Zion, Thy God reigneth!
In the Old Testament, Isaiah prophesied that God would pour out the Holy Spirit on the coming Christ and preach the gospel of salvation through Christ. (Isa 61:1-4)
Isa 61:1 The Spirit of the Lord God is upon me; because the Lord hath anointed me to preach good tidings unto the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound; 2 To proclaim the acceptable year of the Lord, and the day of vengeance of our God; to comfort all that mourn; 3 To appoint unto them that mourn in Zion, to give unto them beauty for ashes, the oil of joy for mourning, the garment of praise for the spirit of heaviness; that they might be called trees of righteousness, the planting of the Lord, that he might be glorified. 4 And they shall build the old wastes, they shall raise up the former desolations, and they shall repair the waste cities, the desolations of many generations.
Jesus revealed that he was the Christ prophesied by Isaiah in the Old Testament. (Luke 4:16-21)
Luke 4:16 And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the sabbath day, and stood up for to read. 17 And there was delivered unto him the book of the prophet Esaias. And when he had opened the book, he found the place where it was written, 18 The Spirit of the Lord is upon me, because he hath anointed me to preach the gospel to the poor; he hath sent me to heal the brokenhearted, to preach deliverance to the captives, and recovering of sight to the blind, to set at liberty them that are bruised, 19 To preach the acceptable year of the Lord. 20 And he closed the book, and he gave it again to the minister, and sat down. And the eyes of all them that were in the synagogue were fastened on him. 21 And he began to say unto them, This day is this scripture fulfilled in your ears.
God loves us and sent Christ to this earth to save us. (John 3:16)
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Those who believe that Jesus is the Christ have eternal life. (John 20:31)
John 20:31 But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.