Was meditating on this recently...
The first time the gospel is given, is in Genesis (protoevangelium).
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Genesis 3:15 (ESV) I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel.”
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This is picked up in one of the Psalms.
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Psalms 91:11-13 (ESV) For he will command his angels concerning you to guard you in all your ways.
On their hands they will bear you up, lest you strike your foot against a stone.
You will tread on the lion and the adder; the young lion and the serpent you will trample underfoot.
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When the promised seed actually comes, the serpent seeks to twist what is said...
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Matthew 4:5-6 (ESV) Then the devil took him to the holy city and set him on the pinnacle of the temple and said to him, “If you are the Son of God, throw yourself down, for it is written, ‘He will command his angels concerning you,’ and ‘On their hands they will bear you up, lest you strike your foot against a stone.’”
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Notice that satan is quoting Psalm 91:11-12, but conveniently left out verse 13 which is about what the messiah will do to him.
Here, we see satan eisegete the passage.
The response from the messiah is that, to do this would be to test God - which we shouldn't do.
Jesus doesn't consider this to be "walking in faith" or "laying hold of God's promise for your life" - but to be testing God.
Even though, Christ's incarnation is the fulfillment(partial?) of the protoevangelium
