Abu Ya'fur (may Allah have mercy on him) said that an elder of Khuza'ah had been appointed by al-Hajjaj as his deputy over Makkah. He said that Sayyiduna Umar (may Allah be pleased with him) was a forceful man and used to push at the Corner, so the Messenger of Allah (peace and blessings be upon him) said to him: "O Umar, do not push at the Corner, for you harm the weak. If you see a clear space, touch it; otherwise face it, say the takbir and move on."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9262