Nafi' (may Allah have mercy on him) said that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would enter Makkah in the forenoon, come to the House, touch (the Black Stone) and say: 'Bismillah wallahu akbar' (In the name of Allah, and Allah is the Greatest).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9250