It is not near - That is, the threatened invasion.

This city is the caldron, and we be the flesh - See the vision of the seething pot, Jeremiah 1:13. These infidels seem to say: "We will run all risks, we will abide in the city. Though it be the caldron, and we the flesh, yet we will share its fate: if it perish, we will perish with it." Or they may allude to the above prediction of Jeremiah, in order to ridicule it: "We were to have been boiled long ago: but the fulfillment of that prediction is not near yet."

Ezekiel 3:2,17 So I opened my mouth, and he caused me to eat that roll...

Ezekiel 20:46,47 Son of man, set your face toward the south, and drop your word toward the south, and prophesy against the forest of the south field...

Ezekiel 21:2 Son of man, set your face toward Jerusalem, and drop your word toward the holy places, and prophesy against the land of Israel,

Ezekiel 25:2 Son of man, set your face against the Ammonites, and prophesy against them;

Isaiah 58:1 Cry aloud, spare not, lift up your voice like a trumpet, and show my people their transgression, and the house of Jacob their sins.

Hosea 6:5 Therefore have I hewed them by the prophets; I have slain them by the words of my mouth...

Hosea 8:1 Set the trumpet to your mouth. He shall come as an eagle against the house of the LORD, because they have transgressed my covenant...

Covenanting Enforced by the Grant of Covenant Signs and Seals.
To declare emphatically that the people of God are a covenant people, various signs were in sovereignty vouchsafed. The lights in the firmament of heaven were appointed to be for signs, affording direction to the mariner, the husbandman, and others. Miracles wrought on memorable occasions, were constituted signs or tokens of God's universal government. The gracious grant of covenant signs was made in order to proclaim the truth of the existence of God's covenant with his people, to urge the performance …
John Cunningham—The Ordinance of Covenanting