It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) performed Tawaf of the Ka'bah while riding a camel. When he reached the Black Stone, he would point towards it with something (a stick) in his hand and say « اللهُأَكْبَرُ ».
Hadith Referenceصحيح ابن خزيمه / جماع أبواب ذكر أفعال اختلف الناس فى إباحته للمحرم، نصت سنة النبى صلى الله عليه وسلم أو دلت على إباحتها / 2722