لِلَّهِ الْأَمْرُ مِنْ قَبْلُ وَمِنْ بَعْدُ.
Translation: The command belongs to Allah before and after.
Although both words follow the preposition min, they retain ḍamma. The ḍamma is a fixed building vowel, not a nominative case ending.
Book example: لِلَّهِ الْأَمْرُ مِنْ قَبْلُ وَمِنْ بَعْدُ
Authority belongs to Allah.
Li-llāhi: fronted predicate phrase; al-amru: postponed subject; min qabl and min baʿd: prepositional phrases with indeclinable nouns in genitive positions.