Sayyiduna Ibn Abbas (may Allah be pleased with them both) used to say that the Prophet (peace and blessings be upon him) had crossed the valleys and he had also brought the sacrificial animal with him, therefore, the Prophet (peace and blessings be upon him) had no choice but to perform the Tawaf of the House of Allah and the Sa'i between Safa and Marwah before standing at Arafah. But O people of Makkah! You should delay your Tawaf until you return back.