3 Jesus answered and said to him, “Most assuredly, I say to you, unless one is born again, he cannot see the kingdom of God.” 4 Nicodemus said to Him, “How can a man be born when he is old? Can he enter a second time into his mother’s womb and be born?” 5 Jesus answered, “Most assuredly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God.” (John 3:3–5, NKJV)
The new birth is a spiritual birth, not a physical one: “That which is born of the flesh is flesh, and that which his born of the Spirit is spirit” (John 3:6). There is one new birth, with two parts (water and the Spirit). To be “born again” one must be “born of water and the Spirit.” What is the “water” of the new birth? It is not the water of physical birth, but the water of spiritual birth. It is the “washing of water” that happens when sin is washed away by the blood of Christ. It is the cleansing that occurs in water baptism (read Acts 22:16; Romans 6:3; Acts 8:35-39). The Bible says, “baptism doth also now save us” (1 Peter 3:21, KJV). What is “the Spirit” of the new birth? It is the Spirit of God, whose seed (the word of the kingdom) is planted into the heart of the sinner (Matt. 13:19, 23; Ephesians 5:26; 1 Peter 1:22-23). The Spirit of God acts upon the heart by His word, producing faith, convicting the sinner, and persuading him to obey Jesus to be saved (Acts 2:37-38, 39-41). The new birth is “not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit” (Titus 3:5). Have you been born of water and the Spirit? Only then can you enter the kingdom of God (John 3:5).