Born Again was a new term that was introduced by Jesus. It includes both New and Old Covenant believers.
Baptism in the Spirit and Circumcision by the Spirit are both types of regeneration. Nobody can enter the Kingdom of God, much less see it unless they are Born Again. When we believe in God and make Jesus our Lord and Saviour, He baptizes us with his Spirit which makes us a Child of God. Nobody can see God unless He first opens their eyes, their ears and their minds.
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