Like the seasons return year after year, so does the snake.

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John 3:14-15 ESV

14 And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, 15 that whoever believes in him may have eternal life. 

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Isaiah 6:2-3 ESV

2 Above him stood the seraphim. Each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew. 3 And one called to another and said:

“Holy, holy, holy is the Lord of hosts;
the whole earth is full of his glory!”[a]

Revelation 4:8 ESV

8 And the four living creatures, each of them with six wings, are full of eyes all around and within, and day and night they never cease to say,

“Holy, holy, holy, is the Lord God Almighty,
    who was and is and is to come!”

.... let the light shine! 

Isaiah 6:2-3 ESV

16 “Behold, I am sending you out as sheep in the midst of wolves, so be wise as serpents and innocent as doves.