Here are 2 Bible verses about the speed of light, curated from both the Old and New Testaments of the Holy Bible, King James Version, arranged from most to least relevant.
Job 37:3 KJV
3 He directeth it under the whole heaven, and his lightning unto the ends of the earth.
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Matthew 7:13-14 KJV
13 Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat: 14 Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.