Ezekiel was called to be a watchman, a common role for Old Testament prophets (see Isaiah 56:10; Jeremiah 6:17; Hosea 9:8). The watchman looked out for the community. He had to warn people about approaching enemies so they could find safety in time. In this case, the enemy was not a human invader but God. If Ezekiel stayed silent, he would be responsible for the blood of those he failed to warn.