“Wherefore as I live”, says the Lord Yahweh, “surely because you have defiled my sanctuary with all your detestable things, and with all your abominations, therefore will I also diminish you, nor shall my eye spare, and I will also have no pity.”
A further indictment was that they had defiled the temple with their abominations and idolatry (see Ezekiel 8:10). They had diminished God. That is why He would diminish them. There would be no mercy, no pity, because they had deliberately polluted the temple and brought dishonour on God, likening Him by their behaviour to creeping and detestable things.