When he came to Quba in migration, the Prophet (PBUH) was hosted as a guest at the house of Kolthoum bin Al-Hadam, accompanied with his family and the family of Abu Bakr when they came. Kolthoum bin Al-Hadam is from Bani Amro bin Malek bin Al-Aws. Sa’ad bin Khaithama, God bless him, is from Bani Al-Salam bin Imro’ Al-Qais bin Malek bin Al-Aws. The site of their houses has no traces nowadays. No one recognizes the exact location of their homes. People used to reach both houses after their visits to Quba Mosque. It was said that the Prophet (PBUH) stayed at Kolthoum’s house and adopted the house of Sa’ad as a seating place to meet people. No traces of them nowadays.
In order to know all the holy sites the foot of the Prophet (pbuh) had treaded on; download Alakoutarassoul application which supports navigation maps without an internet connection.