Jesus quoted Deuteronomy more than any other book in the Hebrew Bible. This is easily understandable when one reads Deuteronomy, as it is filled with laws. David Sanford's Bible projects have been published by renowned publishers such as Zondervan, Tyndale, Thomas Nelson, Doubleday, Barbour and Amazon. However, many writers agree that the most cited books in the Gospels are Deuteronomy and Psalms.
The law in Deuteronomy is a response to God's grace and not a way to earn His favor. Matthew, Mark, Luke, John, Philip, Peter, Paul and Jesus all quoted from Isaiah's prophecies more than any other prophet combined. Jesus' frequent quoting of the Scriptures serves as an example of why memorizing and quoting them is beneficial for believers. The New Testament cites Isaiah's prophecies more than any other prophet combined.
They directly quote 30 of Isaiah's chapters and indirectly cite eight more, for a total of 38 chapters. In Deuteronomy, the law is surrounded by grace and keeping it is a response to grace received and expected. For believers today, Esther's book coordinates with the rest of the Old Testament to foreshadow Jesus as deliverer and mediator of God's people. Interestingly, Zechariah - probably the darkest and most inscrutable book in the Old Testament - occupies a higher place than any other prophetic book except Isaiah.
Additionally, Jesus used Deuteronomy more than any other book in the Old Testament in his own life. Since Jesus is at the core of the gospel and Deuteronomy was so important to Him, it should not be difficult to find the gospel in this last book of Moses' Pentateuch.