Sayyiduna Umar (may Allah be pleased with him) gave permission to the pure wives of the Prophet (peace and blessings be upon him) (may Allah be pleased with them) to perform Hajj, and sent Uthman bin Affan and Abd al-Rahman bin Awf (may Allah be pleased with them both) with them. Uthman (may Allah be pleased with him) announced that no one should come near them, nor should anyone look at them except as far as the eye reaches, while they were riding in howdahs on camels. He settled them at the beginning of the mountain pass, and the two of them stayed at its far end, and no one sat near them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8621