In the Bible, there is no specific mention of the phrases "old flesh" and "new flesh." However, there are similar concepts discussed in relation to the human condition and spiritual transformation. One relevant concept is the contrast between the "old self" and the "new self" or "new creation." The Apostle Paul, in his letters, often discusses this dichotomy. In his letter to the Ephesians, for example, Paul writes about putting off the "old self" characterized by sinful and worldly desires and putting on the "new self" created in the likeness of God (Ephesians 4:22-24). The "old self" refers to the person we were before accepting Jesus Christ as our Lord and Savior. It represents our sinful nature and the desires that are contrary to God's will. The "new self," on the other hand, represents the transformation that occurs in a person's life when they become a follower of Christ. It involves aligning oneself with God's purposes, living a life of righteousness, and being conformed to the image of Christ. This transformation is often described metaphorically as being "born again" or "born of the Spirit" (John 3:3-8), where a person's old life is put to death, and they are made spiritually alive in Christ. The process involves a change of heart, mind, and behavior, as well as the indwelling of the Holy Spirit, who empowers believers to live according to God's purposes. While the specific phrases "old flesh" and "new flesh" may not be used in the Bible, the concepts of the old self and new self are closely related and convey the idea of the spiritual transformation that occurs when one becomes a follower of Christ. Scripture References: - https://biblehub.com/ezekiel/36-26.htm Additional Study Material/Readings: - https://www.cslewisinstitute.org/resources/dying-to-the-flesh/ - https://www.ligonier.org/learn/qas/why-did-god-promise-to-give-a-new-heart-of-flesh-to-his-old-testament-people