Brother: A Fraternal Epithet, Especially Among Christians--Instituted by Christ
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Matthew 12:50
For whoever does the will of My Father in heaven is My brother and sister and mother.”
Matthew 25:40
And the King will reply, ‘Truly I tell you, whatever you did for one of the least of these brothers of Mine, you did for Me.’
Hebrews 2:11, 12
For both the One who sanctifies and those who are sanctified are of the same family. So Jesus is not ashamed to call them brothers. / He says: “I will proclaim Your name to My brothers; I will sing Your praises in the assembly.”