John 1:8-9
He was not the Light, but he came to bear witness to the Light.
John 5:35
He was the 'Lamp that was burning' and shining, and you were ready to rejoice, for a time, in his light.
Treasury of Scripture Knowledge
Summary
But Abishai the son of Zeruiah succoured him, and smote the Philistine, and killed him. Then the men of David sware unto him, saying, Thou shalt go no more out with us to battle, that thou quench not the light of Israel.