Question: where in the bible does it say greet your brother with a holy kiss?
Answer: 2 Corinthians 13:12 — "Greet one another with a holy kiss" (Greek: ἀσπάσασθε ἀλλήλους ἐν ἁγίῳ φιλήματι). 1 Thessalonians 5:26 — "Greet all the brothers with a holy kiss" (Greek: ἀσπάσασθε τοὺς ἀδελφοὺς πάντας ἐν φιλήματι ἁγίῳ).