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Jyutping mat6 wai6 jin4 zi1 bat1 jyu6
Pinyin wù wèi yán zhī bù yù

Definitions (Wiktionary)
  1. phrase, idiomatic
    Don't say you haven't been forewarned.
    • 倘有不法之徒,膽敢陰謀搗亂,本府本處言出法隨,勿謂言之不預。
      倘有不法之徒,胆敢阴谋捣乱,本府本处言出法随,勿谓言之不预。
      tǎng yǒu bù fǎ zhī tú , dǎn gǎn yīn móu dǎo luàn , běn fǔ běn chù yán chū fǎ suí , wù wèi yán zhī bù yù .
      Henceforward, should any lawless person dare to plot disruption, the Border Region Government and the Rear Headquarters will enforce these regulations to the letter and will accept no plea of ignorance.

勿謂言之不預 [-谓---预]

Jyutping
Pinyin wù wèi yán zhī bù yù

Definitions (CC-CEDICT)
  1. (idiom) don't say you haven't been forewarned (threat used by the PRC in international diplomacy)
Examples (Wiktionary)
  1. Mandarin
    倘有不法之徒,胆敢阴谋捣乱,本府本处言出法随,勿谓言之不预。
    倘有不法之徒,膽敢陰謀搗亂,本府本處言出法隨,勿謂言之不預。
    tǎng yǒu bù fǎ zhī tú , dǎn gǎn yīn móu dǎo luàn , běn fǔ běn chù yán chū fǎ suí , wù wèi yán zhī bù yù .
    • Henceforward, should any lawless person dare to plot disruption, the Border Region Government and the Rear Headquarters will enforce these regulations to the letter and will accept no plea of ignorance.
  2. Mandarin
    勿谓言之不预也,其凛遵毋忽
    勿謂言之不預也,其凜遵毋忽
    wù wèi yán zhī bù yù yě , qí lǐn zūn wú hū
    • Do not say that you were not warned in due time! Tremblingly obey and show no negligence!