For I am the LORD: I will speak, and the word that I shall speak shall come to pass; it shall be no more prolonged: for in your days, O rebellious house, will I say the word, and will perform it, saith the Lord GOD.
The word that I shall speak shall come to pass - in opposition to their scoff, "The vision faileth" (Ezekiel 12:22). The repetition, "I will speak, and the word that I shall speak," etc. (or as Fairbairn, 'For I, Yahweh, will speak, whatever word I shall speak, and it shall be done'), implies, that whenever God speaks the effect must follow; for God, who speaks, is not divided in Himself (Ezekiel 12:28; Isaiah 55:11; Daniel 9:12; Luke 21:33).
It shall be no more prolonged - in opposition to the scoff (Ezekiel 12:22). "The days are prolonged."
In your days - while you are living (cf. Matthew 24:34).