Jesus answered, "Most assuredly I tell you, unless one is born of water and spirit, he can't enter into the Kingdom of God!
The new birth "of water and of the Spirit" is one birth, not two, despite there being two elements in it.  One of these elements "born of water," is water baptism, that being the element of the new birth for which man himself is responsible for the doing of it.  Thus, Saul of Tarsus was commanded, "Get thyself baptized" (Acts 22:16).[9]  The other element of the new birth, "born of the Spirit," is the reception of the Holy Spirit of promise, which is an earnest of our inheritance  (Ephesians 1:13,14). Contrasting with what is done by man, this endowing with the Holy Spirit is what is done by God. The great heresy regarding this one birth is the doctrine that people may omit their part, not being baptized, but that God will go ahead, despite that, and endow the believer with the Holy Spirit anyway!   John 3:5 teaches that both elements are absolutely necessary in the new birth.