Matthew 9:30
And their eyes were opened. And Jesus sternly warned them, See that no one knows about it. The strict warning to secrecy follows the healing — the Messianic secret that Matthew presents less prominently than Mark but which appears here. The timing of the disclosure of Jesus' full identity is important: the crowds who know that he heals are not yet ready to understand what his healing means. Luke 4:41 records Jesus rebuking demons who proclaim him Son of God because they knew he was the Christ — the what is known before the why is understood creates misunderstanding. Isaiah 42:2 describes the servant who does not cry out or make his voice heard in the street — the quiet, unannounced character of Jesus' mission is part of what he is.