Melchizedek is first mentioned in Genesis after Abraham returns from battle (Genesis 14:17-20). Melchizedek is a priest (before the priesthood was instituted) and Abraham gave him a tenth (tithe) of the goods he recovered.
Key verse about Melchizedek: For it is declared: “You are a priest forever, in the order of Melchizedek” (Hebrews 7:17, NIV)
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 1,000-page website ABibleADay.com to encourage people to explore the Bible. His main blog and many books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.