Uthman prayed four units because he had taken it as a place of residence.
حدثنا هناد بن السري عن أبي الأحوص عن المغيرة
إن عثمان صلى أربعا لأنه اتخذها وطنا
No references are available.
Its chain of transmission is daif. The chain is disconnected, and Mughira bin Miqsam narrated with "an" (without explicit affirmation of direct transmission).Muhammad bin Ala narrated to us, informed us.