"We have the Annunciation, the Conception, the Birth and the Adoration, as described in the first and second chapters of Luke's gospel; and as we have historical assurance that the chapters in Matthew's gospel which contain the miraculous birth are an after addition not in the earliest manuscripts, it seems probable that these two poetical chapters in Luke may also be unhistorical, and borrowed from the Egyptian accounts of the miraculous births of their kings."
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Source : Samuel Sharpe (1863). “Egyptian mythology and Egyptian Christianity, with their influence on the opinions of modern Christendom”, p.19