Dawud ibn Ali reported: Umar ibn al-Khattab, may Allah be pleased with him, said, “If a lost sheep under my care were to die on the banks of the Euphrates, I would expect Allah the Exalted to question me about it on the Day of Resurrection.”
Source: Ḥilyat al-Awliyā’ 137
عن داود بن علي قَالَ قَالَ عُمَرُ بْنُ الْخَطَّابِ رضي الله عنه لَوْ مَاتَتْ شَاةٌ عَلَى شَطِّ الْفُرَاتِ ضَائِعَةً لَظَنَنْتُ أَنَّ اللَّهَ تَعَالَى سَائِلِي عَنْهَا يَوْمَ الْقِيَامَةِ
137 حلية الأولياء لأبي نعيم عمر بن الخطاب