«وَقَامَ عُمَرُ وَعُمَرٌ آخَرُ»
Translation: “ʿUmar stood up, and another ʿUmar stood up.”
عُمَرُ: a particular proper name, diptote because of proper-name status and ʿadl. عُمَرٌ: another person of that name referred to indefinitely; it admits tanwīn once that name-specific cause no longer applies.