وَعَدَ اللَّهُ الَّذِينَ آمَنُوا مِنْكُمْ وَعَمِلُوا الصَّالِحَاتِ لَيَسْتَخْلِفَنَّهُمْ فِي الْأَرْضِ كَمَا اسْتَخْلَفَ الَّذِينَ مِنْ قَبْلِهِمْ
Allah promised those among you who believed and did righteous deeds that He would establish them as successors in the land, as He had established those before them. (al-Nūr 24:55)
Istikhlāf means being granted succession and authority in the land. Faith and righteous deeds are expressly mentioned in the promise.