Sahih Muslim, Hadith 1266a

Allah's Messenger (ﷺ) and his Companions came to Mecca and the fever in Medina had weakened them. Thereupon the polytheists (of Mecca) said: There would come to you a people whom the fever has made weak and they have suffered severely from it. They sat in Hatim. Thereupon Allah's Apostle (ﷺ) commanded them to walk quickly ift three circuits and walk (in four) between the two corners. so that the polytheists should. see their endurance. The polytheists then said (to one anothery You were under the impression that fever had emaciated them. whereas they are stronger than so and so. Ibn Abbas said: He (the Holy Prophet) did not command them (the Muslims) to walk quickly in all the circuits out of kindness to them.