It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that I myself saw the Prophet (peace and blessings of Allah be upon him) touching the Black Stone, so I will continue to touch it regardless of any hardship or ease.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5201
Hadith Gradingحکم دارالسلام:إسناده صحيح ، خ : 1606 ، م : 1268 .