Allah Ta’ala is the Only Sustainer. He has allocated and provided the sustenance for the entire creation. This is what Allah Himself has taken as his responsibility.
Ours is to ensure that we seek this sustenance vial halal means.
Listen to a series of talks delivered by my beloved father, Shaykhul Hadith Moulana Haroon Abasoomar (rahimahullah) on this topic: