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Where does the Bible say “where two or three are gathered together in my name”?

It is in Matthew 18:20 · King James Version

“For where two or three are gathered together in my name, there am I in the midst of them.”
Read the chapter Matthew 18 →

See also

Psalms 133:1

A Song of degrees of David. Behold, how good and how pleasant it is for brethren to dwell together in unity!

Hebrews 10:25

Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching.