Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever performs tawaf of the House, counting off seven circuits, for every step a good deed will be written for him, a sin will be erased from him, a rank will be raised for him because of it, and he will have a reward equal to freeing a slave."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9429