This is because Allah does not change the favour He has bestowed upon any people until they first change themselves, and indeed Allah is All Hearing, All Knowing.
"Wancan ne, dõmin lalle ne, Allah bai kasance Mai canza wata ni'ima wadda ya ni'imtar da ita a kan wasu mutãne ba fãce sun sãke abin da yake ga rãyukansu, kuma dõmin lalle Allah ne Mai jĩ, Masani."