‘A'isha said:
When God’s messenger came to Medina Abu Bakr and Bilal were prostrated with fever and when I went to God’s messenger and told him he said, "O God, make Medina as dear to us as Mecca, or more so, make it healthy, bless us in its sa' and its mudd, and transfer its fever and put it in al-Juhfa."
Bukhari and Muslim.