“warned.” The Greek word translated “warned” is epitimaō (#2008 ἐπιτιμάω). Usually epitimaō means to express strong disapproval of someone: rebuke, reprove, censure; or to speak seriously, and thus warn in order to prevent an action or bring one to an end. It can also mean “punish” (cp. BDAG Lexicon). Epitimaō is also used in a technical sense in the NT, see commentary on Mark 1:25. Jesus “warned” his disciples, no doubt including some of what might happen if they ignored what he said.