Cry aloud, spare not, lift up thy voice like a trumpet, and shew my people their transgression, and the house of Jacob their sins.
Cry aloud (Hebrew, bªgaarown (H1627)) - with the throat; i:e., with full voice, not merely from the lips (1 Samuel 1:13). Speak loud enough to arrest attention.
Show my people their transgression. "My people," i:e., the Jews in Isaiah's time, and again in the time of our Lord, more zealous for externals than for inward holiness. Rosenmuller thinks the reference to be to the Jews in the captivity, practicing their rites to gain God's favour and a release; and that hence, sacrifices are not mentioned, but only fasting and Sabbath observance, which they could keep, though far away from the temple in Jerusalem. The same also applies to their present dispersion, in which they cannot offer sacrifices, but can only show their zeal fastings, etc. Compare as to our Lord's time, Matthew 6:16; Matthew 23:1-39; Luke 18:12.