Deut 6:15, 1 Cor 16:22, Gal 1:8-9
God is a jealous God. (Deut 4:24, Deut 6:15)
Deut 4:24 For the Lord thy God is a consuming fire, even a jealous God.
Deut 6:15 (For the Lord thy God is a jealous God among you) lest the anger of the Lord thy God be kindled against thee, and destroy thee from off the face of the earth.
Those who do not love Jesus 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.
Anyone who preaches any gospel other than that Jesus is the Christ will be cursed. (Gal 1:8-9)
Gal 1:8 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.