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Where does the Bible say money is the root of all evil?

It is in 1 Timothy 6:10 · King James Version

“For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows.”
Read the chapter 1 Timothy 6 →

See also

Hebrews 13:5

Let your conversation be without covetousness; and be content with such things as ye have: for he hath said, I will never leave thee, nor forsake thee.

Matthew 6:24

No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.