Where Is the Passage: One Must Obey The Gospel to be Saved?

All accountable human beings have transgressed the law of God (1 John 3:4) and have sinned against a holy and righteous God (Romans 3:23). We should be eternally grateful that God is gracious and merciful who desires all men to be saved and to come to the knowledge of the truth (Titus 2:11-14; 1 Timothy 2:4). God has set forth conditions which He has placed on man in order to receive the free gift of eternal life (Romans 5:1; Romans 6:23). God has always required man's trust (faith) and obedience to His Divine will in every dispensation (see Hebrews 11). God has stated that in order for men to be saved, they must obey the gospel of Christ:

2 Thessalonians 1:7-9 states: "and to give you who are troubled rest with us when the Lord Jesus is revealed from heaven with His mighty angels, in flaming fire taking vengeance on those who do not know God, and on those who do not obey the gospel of our Lord Jesus Christ. These shall be punished with everlasting destruction from the presence of the Lord and from the glory of His power, when He comes, in that Day, to be glorified in His saints and to be admired among all those who believe, because our testimony among you was believed." (see also Acts 5:32; Romans 6:17-18; Hebrews 5:8-9; 1 Peter 1:22-25).

From this context, we understand that if a person does obey the gospel, then that person can be saved by God. If a person does not obey the gospel, then that person will be punished for all eternity.

The gospel of Christ is about the Son of God who came among men to die on the cross to shed His blood for the remission of mankind's sins (Matthew 26:28), was buried in the tomb for three days, and then rose again (1 Corinthians 15:1-4). How one obeys the gospel in response to God's grace (Romans 5:1) is to believe (obey - John 3:36) the Son of God, repent of past sins (Acts 2:38), confess the name of Jesus before men (Romans 10:9,10), be immersed in water for the remission of sins to come into contact with the cleansing blood of Jesus (Romans 6:3,4), and remain a true disciple of Jesus all the days of one's life (John 8:31,32.