What is the context of Jude 1:18-19?

• Apostates Predicted (Jude 1:16-19 true)
• Persevere in the Love of God (Jude 1:17-23 true)
• A Call to Remain Faithful (Jude 1:17-23 true)
• Advice to the Readers (Jude 1:17-23 true)
• A Call to Persevere (Jude 1:17-23 true)
• The Apostates’ Doom (Jude 1:12-19 true)
• Keep Yourselves in the Love of God (Jude 1:17-25 true)