Here is a list of the serious sins I found in the Bible. These are the “weightier matters” Jesus referred to in Matthew 23:23, 24. These are the things we should teach and admonish fervently without compromise, warning people to let the Holy Spirit help them out of these sins. The point of this list is to show that these things are clearly defined in scripture and clear to our conscience.

Sin Scriptures
Murder, Brutality Revelation 21:8; Mark 7:21; 5:21; 10:19; 19:18; Luke 18:20; Romans 1:29; 1 Peter 3:15; 4:15; Matthew 15:19; 2 Timothy 3:3
Adultery Matthew 5:27-28, 32; 19:9,18; Mark 10:11-12; Luke 16:18; Hebrews 13:4; 1 Corinthians 6:9-10; Mark 7:21; John 8:1-11
Stealing, Thievery Ephesians 4:28; 13:9; Matthew 19:18; Mark 10:19; Luke 18:20; Romans 2:21; 13:9; 1 Corinthians 6:10; Mark 7:21; John 10:1, 8; 1 Peter 4:15; Matthew 15:19
Denying Christ, cowardly Matthew 10:26-33; Luke 12:9; 1 John 2:22-23; Revelation 21:8
Drunkenness/Carousing Romans 13:13; 15:13; Ephesians 5:18; 1 Corinthians 5:11; 6:10; Colossians 3:13; 1 Peter 4:3; Galatians 5:21
Greed/Laying up treasures on earth Mark 7:22, Ephesians 4:19; 5:3; 2 Peter 2:14; Matthew 6:19-21; 19:21; 1 Timothy 6:9-10; Luke 12:21, 33; 18:22
Deceit/Defraud/Lie/Cheat/Purger/ Treachery/Swindling/Slander Matthew 15:19; Mark 7:22; Acts 13:10; Romans 1:29; 1 Peter 3:10; 1 Corinthians 6:7-10, Prov 11:1; 12:22; Revelation 21:8, 27; 22:15; Ephesians 4:25-31; Romans 9:1; 2 Corinthians 11:31; Galatians 1:20;  1Tim 1:9-10; 2 Timothy 2:7; Colossians 3:8; 2 Peter 2:1; 1 Corinthians 4:13; Romans 1:30; 1 Corinthians 5:10-11; 2 Timothy 3:4
Reviling/insulting Matthew 5:22; 1 Corinthians 4:17; 5:11; 6:10; 5:11; 2 Timothy 3:2; 1 Peter 2:23
delight in evil 1 Corinthians 13:6, Romans 1:30-32
Idolatry/Witchcraft 1 Corinthians 5:11; 6:9; Galatians 5:20; Revelations 21:8; Ephesians 5:5
Ungodliness/unrighteousness/ wickedness/Unholiness/ Vile/Evil thoughts/Living for pleasure (undefined) Romans 1:18; 4:5; 5:6; 2:8; 6:13; 1 Timothy 1:9; 2 Timothy 2:16; Titus 2:12; 2 Peter 2:5, 6, 7; 1 John 1:9; 5:17; 1 Corinthians 6:9; Luke 11:39; Acts 8:22; Romans 1:29; 1 Corinthians 5:8, 13; Ephesians 6:12; 2 Thessalonians 2:10, 12; 2 Timothy 2:19; 2 Timothy 3:2; Hebrews 12:14;  Revelation 21:8; Mark 7:21; Matthew 15:19; 2 Timothy 3:4
Blasphemy Mark 8:38; Acts 18:6
Haters of God Romans 1:30
Judging (with evil motives, not as by discerning) Matthew 7:1-5; Romans 2:1; 14:13; Luke 6:37 James 4:11
Unbelief, lack of faith James 1:6; Mark 9:24; Hebrews 3:12, 19; 1 Timothy 5:8; 2 Corinthians 6:14-15; 7:13; 2 Corinthians 4:4; Titus 1:15; Revelation 21:8
Taking care of family members 1 Timothy 5:8
Immorality/Fornication/ impurity/lewdness/ sensuality/prostitution/lust Galatians 5:19; Revelation 21:8; Ephesians 5:3-5; 1 Corinthians 5:9-11; 6:13, 18; 1 Thessalonians 4:3-8; 1 Peter 4:3; Mark 7:21-22; 1 Corinthians 6:15-16; Galatians 5:19; Mark 7:22; Romans 13:13; 2 Corinthians 12:21; 1 Peter 4:3; Ephesians 4:19; 2 Peter 2:2; 1 Peter 4:3; Titus 3:3; Matthew 5:27-28; 1 Peter 4:3; Matthew 15:19; 18:9; 1 Corinthians 6:9; 1 Timothy 1:10; Romans 1:26-27; 1 Corinthians 6:9
Anger/wrath/Hatred/Bitterness Galatians 5:20; Ephesians 4:26-31,31; 6:4; Colossians 3:8; James 1:19-20; 1 Corinthians 13:5; 1 Timothy 2:8; 2 Timothy 3:3; Titus 3:3; Galatians 5:19; Hebrews 12:15; Romans 2:24; 3:14; Acts 8:23; James 2:7
Disunity/malice/quarrels 1 Corinthians 1:10,  Romans 16:17; Titus 3; Galatians 5:20; Ephesians 4:3; Ephesians 4:31; Romans 1:29; Ephesians 4:31; Colossians 3:8; 5:8; Titus 3:3; 2 Peter 2:1; James 4:1-2; 1 Corinthians 1:11; 2 Timothy 2:23; Galatians 5:20; Romans 1:29; 13:13; 1 Corinthians 3:3; 2 Corinthians 12:20; 1 Timothy 6:4; Rom 1:26-32, 2Cor 7:20
Jealousy/Coveting/Envy Galatians 5:20-26; 1 Corinthians 3:3; 2 Corinthians 12:20; James 3:16; Mark 7:22; Titus 3:3; Mark 7:22; Ephesians 5:5; Acts 20:33; Romans 13:9; 1 Corinthians 5:10-11; 6:1; Mark 7:22; Galatians 5:26; Titus 3:3
immodesty 1 Timothy 2:9-10
Divorce Matthew 5:32; 19:9; Mark 10:11-12; Luke 16:18
obscenity, course joking Ephesians 5:4
Disobedience or dishonoring to parents  Matt 19:18-19, Romans 1:30; 2 Timothy 3:2; Titus 3:3
Pride/arrogance/conceit/Desiring praise of men/boasting Mark 7:22; 1 Peter 5:5, 6; James 4:6; Matthew 23:12; Luke 14:11; 18;14; 1 Corinthians 13:4; 2 Timothy 3:4; John 12:43; 2 Timothy 3:2; 2 Corinthians 12:20; 2 Timothy 3:2; 1 Corinthians 4:6, 18,19; 5:2; 8:1; 13:4; Romans 1:30; 2 Timothy 3:2; Galatians 5:26; 1 Corinthians 4:7; 5:6; 1 Corinthians 13:4
Selfish, selfish ambition, self-seeking Gal 2:20; 5:20; 1 Corinthians 13:5; 2 Timothy 3:2
Unforgiveness Matthew 6:14-15; Mark 11:25-26; 1 Corinthians 6:1-7
Hypocrisy (acting something you are not) Matthew 7:5; Mark 12:15; Luke 12:1; Romans 12:9
Knowing to do good but not doing it James 4:17
Speaking against the Holy Spirit Matthew 12:32; Luke 12:10
not repenting of sin Luke 13:3; Prov 28:13