Surely the following passages from God's Word are sufficient, without comment or addition to bring the assurance of salvation to any seeking soul.
Be it known unto you therefore, men and brethren, that through this man is preached unto you the forgiveness of sins: And by him all that believe are justified from all things, from which ye could not be justified by the law of Moses (Acts 13:38-39).
To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins (Acts 10:43).
To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus (Romans. 3:26).
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness (Romans. 4:5).
Therefore being justified by faith, we have peace with God through our Lord Jesus Christ (Romans. 5:1).
There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit (Romans. 8:1).
Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life (John. 5:24).
These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God (1 John. 5:13).