We see Jesus witnessing to Nicodemus in the third chapter of the Gospel of John. Do we know through the Bible if Nicodemus accepted Jesus as his Savior by believing in Him?

Now there was a man of the Pharisees named Nicodemus, a member of the Jewish ruling council. He came to Jesus at night and said, "Rabbi, we know you are a teacher who has come from God. For no one could perform the miraculous signs you are doing if God were not with him."

In reply Jesus declared, "I tell you the truth, no one can see the kingdom of God unless he is born again."

"How can a man be born when he is old?" Nicodemus asked. "Surely he cannot enter a second time into his mother's womb to be born!"

Jesus answered, "I tell you the truth, no one can enter the kingdom of God unless he is born of water and the Spirit….

"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life."
(John 3:1-5,16)
After this encounter with Jesus, we see Nicodemus reasoning with the Pharisees on Jesus' behalf in the seventh chapter of the Gospel of John. In addition, we see him helping Joseph of Arimathea bury the body of Jesus.
Later, Joseph of Arimathea asked Pilate for the body of Jesus. Now Joseph was a disciple of Jesus, but secretly, because he feared the Jews. With Pilate's permission, he came and took the body away.

He was accompanied by Nicodemus, the man who earlier had visited Jesus at night. Nicodemus brought a mixture of myrrh and aloes, about seventy-five pounds.
(John 19:38-39)
Because Nicodemus identified with Jesus after his crucifixion I would say he had believed and was born again.

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