The Mystery of Crucifixion

Apollonius of Tyana (the Antichrist) was initiated into the Arcanum of Egypt in the Great Pyramid, where he hung upon a cross until unconscious and was then laid in the tomb (the coffer) for three days. While his body was unconscious, his soul was thought to pass into the realms of the immortals (the place of death). After it had vanquished death (by recognizing that life is eternal), it returned again to the body, which then rose from the coffer, after which he was hailed as a brother by the priests, who believed that he had returned from the land of the dead. This concept was, in substance, the teaching of the Mysteries.

JP Lundy has written:
Dupuis tells us that Mithra was put to death by crucifixion and rose again on the 25th of March. In the Persian Mysteries, the body of a young man, apparently dead, was exhibited, which was feigned to be restored to life. By his sufferings, he was believed to have worked their salvation, and on this account, he was called their Savior. His priests watched his tomb to the midnight of the vigil of the 25th of March, with loud cries and in darkness; when all at once the light burst forth from all parts, the priest cried, Rejoice, O sacred initiated, your God has risen. His death, his pains, and sufferings have worked your salvation.
Plato learned his theology in Egypt and the East and must have known of the crucifixion of Krishna, Buddha, and Mithra [et al.]. At any rate, the religion of India had its mythical crucified victim long anterior to Christianity,

MP Hall (1928). The Secret Teachings of All The Ages

The Mystery of Crucifixion

Apollonius of Tyana (the Antichrist) was initiated into the Arcanum of Egypt in the Great Pyramid, where he hung upon a cross until unconscious and was then laid in the tomb (the coffer) for three days. While his body was unconscious, his soul was thought to pass into the realms of the immortals (the place of death). After it had vanquished death (by recognizing that life is eternal), it returned again to the body, which then rose from the coffer, after which he was hailed as a brother by the priests, who believed that he had returned from the land of the dead. This concept was, in substance, the teaching of the Mysteries. JP Lundy has written:

Dupuis tells us that Mithra was put to death by crucifixion and rose again on the 25th of March. In the Persian Mysteries, the body of a young man, apparently dead, was exhibited, which was feigned to be restored to life. By his sufferings, he was believed to have worked their salvation, and on this account, he was called their Savior. His priests watched his tomb to the midnight of the vigil of the 25th of March, with loud cries and in darkness; when all at once the light burst forth from all parts, the priest cried, Rejoice, O sacred initiated, your God has risen. His death, his pains, and sufferings have worked your salvation.

Plato learned his theology in Egypt and the East and must have known of the crucifixion of Krishna, Buddha, and Mithra [et al.]. At any rate, the religion of India had its mythical crucified victim long before  Christianity.

~ MP Hall (1928). The Secret Teachings of All The Ages