Gal 1:6-9, 1 Cor 16:22, 2 Cor 11:4, Jn 14:6, Acts 4:12, 1 Cor 3:11, 1 Tim 1:3

In the Old Testament, Aaron's sons Nadab and Abihu burned incense before God with other fires that God had not commanded and died. (Lev 10:1-2)

Lev 10:1 And Nadab and Abihu, the sons of Aaron, took either of them his censer, and put fire therein, and put incense thereon, and offered strange fire before the Lord, which he commanded them not. 2 And there went out fire from the Lord, and devoured them, and they died before the Lord.

If you preach any other gospel than the gospel that Jesus is the Christ, you will be cursed. (Gal 1:6-9)

Gal 1:6 I marvel that ye are so soon removed from him that called you into the grace of Christ unto another gospel: 7 Which is not another; but there be some that trouble you, and would pervert the gospel of Christ. 8 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed. 9 As we said before, so say I now again, if any man preach any other gospel unto you than that ye have received, let him be accursed.

If any man does not love Christ, he will be cursed. (1 Corinthians 16:22)

1 Corinthians 16:22 If any man love not the Lord Jesus Christ, let him be Anathema Maranatha.

We must be careful not to receive any other gospel than the gospel that Jesus is the Christ. (2 Corinthians 11:4, 1 Timothy 1:3)

2 Corinthians 11:4 For if he that cometh preacheth another Jesus, whom we have not preached, or if ye receive another spirit, which ye have not received, or another gospel, which ye have not accepted, ye might well bear with him.

1 Timothy 1:3 As I besought thee to abide still at Ephesus, when I went into Macedonia, that thou mightest charge some that they teach no other doctrine,

Jesus is the only way to meet God. (John 14:6, Acts 4:12, 1 Corinthians 3:11)

John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.

Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.

1 Corinthians 3:11 For other foundation can no man lay than that is laid, which is Jesus Christ.