Matthew 10:27 New English Translation

²⁷What I say to you in the dark, tell in the light, and what is whispered in your ear,^[a] proclaim from the housetops.^[b]

Matthew 10:27 tn Grk “what you hear in the ear,” an idiom meaning “say someth. into someone’s ear, i.e., secretly or in confidence, whisper” (BDAG 739 s.v. οὖς 1).
Matthew 10:27 tn The expression “proclaim from the housetops” is an idiom for proclaiming something publicly (L&N 7.51; BDAG 266 s.v. δῶμα). Roofs of many first century Jewish houses in Judea and Galilee were flat and had access either from outside or from within the house. Something shouted from atop a house would be heard by everyone in the street below.

New English Translation (NET)