Surah Al Muzzammil Tafseer

Lord of the east and the west; La ilaha illa Huwa. So take Him a trustee.

meaning, He is the Owner and Controller of affairs in the eastern regions and the western regions. He is the One except whom there is no deity worthy of worship. Just as you single Him out for worship, you should also single Him out for reliance. Therefore, take Him as a guardian and trustee.

This is as Allah says in another Ayah,

فَاعْبُدْهُ وَتَوَكَّلْ عَلَيْهِ

So worship Him and rely upon him. (11:123)

It is also similar to His statement,

إِيَّاكَ نَعْبُدُ وَإِيَّاكَ نَسْتَعِينُ

You (Alone) we worship, and you (Alone) we ask for help. (1:5)

The Ayat with this meaning are numerous. They contain the command to make worship and acts of obedience exclusively for Allah, and to rely solely upon Him