It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that while performing Tawaf of the House of Allah, the Prophet (peace and blessings be upon him) performed Ramal in three circuits; he would walk at his normal pace up to the Yemeni Corner, and when he reached the Black Stone, he would begin Ramal, and he performed four circuits at a normal pace, and this is Sunnah.
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2220
Hadith Gradingحکم دارالسلام:صحيح، على بن عاصم متابع، الجريري كان قد اختلط