Based on the search results provided, there isn't a specific mention of Jesus explicitly stating which of his teachings he regarded as the most precious. However, we can infer from the available information that Jesus placed great emphasis on two interconnected teachings:
1. Love for God and neighbor: Jesus identified this as the greatest commandment when asked. He said, "Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. This is the first and great commandment. And the second is like unto it, Thou shalt love thy neighbour as thyself"[3]. This dual love for God and others forms the foundation of Jesus' ethical teachings.
2. The Kingdom of God: Jesus frequently taught about God's kingdom, emphasizing its importance and how it challenges earthly standards. His parables, teachings, and actions often revolved around explaining the nature of God's kingdom and how to live as its citizens[2].
These teachings are central to Jesus' message and appear to be the most precious in his ministry, as they encompass the essence of his mission and the transformation he sought to bring about in people's lives and relationships with God and others.
Sources
[1] What Were The Most Important Teaching Of Christ Jesus https://christian.net/videos/bible-stories/what-were-the-most-important-teaching-of-christ-jesus/
[2] The Teachings of Jesus - The Gospel Coalition https://www.thegospelcoalition.org/essay/the-teachings-of-jesus-2/
[3] 5 Teachings of Jesus that Will Improve Your Life | Come unto Christ https://www.churchofjesuschrist.org/comeuntochrist/believe/jesus/5-teachings-of-jesus-that-will-improve-your-life
[4] Jesus Was the Ultimate Teacher - Catholic Herald https://catholicherald.org/local/jesus-ultimate-teacher/
[5] 9 Crucial Teachings of Jesus Christians Tend to Ignore - LinkedIn https://www.linkedin.com/pulse/9-crucial-teachings-jesus-christians-tend-ignore-noah-adams