Sa'id bin al-Musayyib said: A slave girl of Sa'd, who was called Zira, went out wearing a new shirt, and the wind uncovered her body, so Umar (may Allah be pleased with him) rushed at her with his whip. Sa'd came to stop him, so Umar struck him with the whip as well. Sa'd began to make up his mind to supplicate against Umar, so Umar handed him the whip and said: Take your retribution (qisas). But Sa'd forgave Umar (may Allah be pleased with them both).
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 307