Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: Ever since I saw the Messenger of Allah (peace and blessings be upon him) kissing and touching these two corners (the Black Stone and the Yemeni Corner), I have never left it, whether in ease or hardship. Ubaidullah said: I asked Nafi’: Did Sayyiduna Ibn Umar (may Allah be pleased with them both) walk between these two corners? Nafi’ said: He used to walk so that it would be easier for him to touch them.
Hadith Referenceسنن دارمي / من كتاب المناسك / 1876