The good shepherd
The Old Testament
I will appoint over them one shepherd, My servant David, and he will feed them. He will feed them and be their shepherd.
Ezekiel 34:23
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In the New Testament
I am the good shepherd. The good shepherd lays down His life for the sheep.
John 10:11
BSB
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Read the full text (25 verses)
God says the shepherds of Israel have failed. So he himself will go and seek his sheep, and he will set up one shepherd over them: 'my servant David'.
When Jesus says 'I am the good shepherd', his listeners knew Ezekiel 34. In that text it is both God himself and 'David' who is the shepherd. Jesus claims both roles.