Now a great many of the Jews knew that He was there; and they came, not for Jesus’ sake only, but that they might also see Lazarus, whom He had raised from the dead. 10 But the chief priests plotted to put Lazarus to death also, 11 because on account of him many of the Jews went away and believed in Jesus. — John 12:9-11.
Not only are Christ’s opponents seeking to kill Him, but they also want to kill resurrected Lazarus, because people believe in Christ through His testimony! They are really rattled by Jesus and His mighty deeds and are afraid of losing their followers to Jesus!