The foundational source of salvation, in which is the true science of salvation is in the Holy Scriptures—The Word of Eloheem.
“And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus. 2 Timothy 3:15 KJV
“And being made perfect, he became the author of eternal salvation unto all them that obey him;”
Hebrews 5:9 KJV
Salvation—the gospel—righteousness by faith: The Three Angels Messages
“For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.”
Romans 1:16 KJV
“In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise,”
Ephesians 1:13 KJV
“Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; by which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; and that he was buried, and that he rose again the third day according to the scriptures: and if Christ be not risen, then is our preaching vain, and your faith is also vain. and if Christ be not raised, your faith is vain; ye are yet in your sins. If in this life only we have hope in Christ, we are of all men most miserable. But now is Christ risen from the dead, and become the firstfruits of them that slept.”
1 Corinthians 15:1-4, 14, 17, 19-20 KJV
Salvation—everlasting covenant.
What is salvation? Deliverance from sin.