The Sermon on the Mount (Matthew 5–7) is the most famous extended teaching Jesus ever gave. It contains the Beatitudes, the Lord's Prayer, the Golden Rule, teaching on anger, lust, forgiveness, worry, and much more. For SRE teachers, it represents some of the richest material in the New Testament — but it also presents a challenge: it is dense, demanding, and easy to flatten into a morality lecture if not taught carefully.
BibleProject has produced a free 10-episode video series on the Sermon on the Mount and a further 14-episode visual commentary series — both freely available at bibleproject.com. These are outstanding preparation resources for SRE teachers before teaching any portion of Matthew 5–7.