Verse 15 marks the shift from the first half of Danielʼs 70th week to the second; the “abomination of desolation” standing in the holy place will signal the transition. The mention of the holy place (v15), Judaea (v.16), and the Sabbath day (v.20) indicates that the setting is Jewish.
Teaching and preaching the gospel is important. Here are a collection of some teaching that was provided in a public forum.