What unites Muslims under common Legal framework?

Muslims are united under a common legal framework primarily through Sharia, which is derived from the Quran, Hadith (sayings and actions of Prophet Muhammad), and various interpretations by scholars. This framework governs various aspects of life, including worship, ethics, and law, promoting a shared sense of identity and community. Additionally, institutions like the Organization of Islamic Cooperation (OIC) help foster legal and diplomatic cooperation among Muslim-majority countries. However, interpretations and implementations of Sharia can vary widely across different cultures and legal systems.