Bartsch pointed to several passages in the Bible that supposedly mention unicorns, although these are now regarded as mistranslations.

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In his book Usus Astronomicus Planisphaerii Stellati of 1624, Jacob Bartsch pointed out several passages in the Bible which mention unicorns:
Deuteronomy 33: ‘his horns are like the horns of unicorns’
Psalm 22: ‘Save me from the lion’s mouth: for thou hast heard me from the horns of the unicorns.’
Isaiah 34: ‘And the unicorns shall come down with them’
Job 39: ‘Will the unicorn be willing to serve thee’
Modern versions of the Bible replace the word ‘unicorn’ with ‘wild ox’.

Rigel (Wikipedia) Rigel is a blue supergiant star in the constellation of Orion. It has the Bayer designation β Orionis, which is Latinized to Beta Orionis and abbreviated Beta Ori or β Ori. Rigel is the brightest and most massive component – and the eponym – of a star system of at least four stars that appear as a single blue-white point of light to the naked eye. This system is located at a distance of approximately 860 light-years (260 pc) from the Sun.

Star Tales - Monoceros (ianridpath.com) The mythical single-horned beast, the unicorn, is represented by this constellation which was unknown to the ancient Greeks. Monoceros was introduced in 1612 under the name Monoceros Unicornis on a globe by the Dutch theologian and cartographer Petrus Plancius. This was the same globe on which Camelopardalis, another of his inventions, first appeared.