كُلُّ شَيْءٍ هَالِكٌ إِلَّا وَجْهَهُ لَهُ الْحُكْمُ وَإِلَيْهِ تُرْجَعُونَ.
Everything will perish except His Face. To Him belongs the judgment, and to Him you will be returned. (Al-Qaṣaṣ 28:88)
Lahu al-ḥukm establishes that judgment and authority belong to Allah. Wa ilayhi turjaʿūn speaks of creation returning to Him.
The continuance of a created thing rests on Allah’s will; it is not everlasting by itself.