Migration to Medina & Bond of Brotherhood
Hazrat Ammar bin Yasir (ra) stayed in the house of Hazrat Mubashar bin Abdul Munzir (ra) when he migrated to Medina. The Holy Prophet (sa) established a bond of brotherhood between Hazrat Huzaifah bin Al-Yeman (ra) and Hazrat Ammar (ra). The Holy Prophet (sa) also granted Hazrat Ammar (ra) a piece of land for his residence.
(At-Tabaqat Al-Kubra, Vol. 3, pp. 189-190, Ammar bin Yasir, Dar-ul-Ihya At-turath Al-Arabi, 1990, Beirut)
Ata bin Abi Rabah states that Abu Salma and Umme Salma migrated and Hazrat Ammar bin Yasir (ra) also went with them as he had an alliance with them. Hazrat Ammar bin Yasir was Hazrat Umme Salma’s foster brother [suckled by same person].
(Al-Mustadrak Ala Al-Sahihain, Vol. 3, p. 471, Hadith 5720, Dar-ul-Haramain Li Al-Taba’ati Wa Al-Nashre Wa Al-Tauzi, 1997 & Musnad Ahmad bin Hanbal, Vol. 8, p. 591, Umme Salma Zauj-ul-Nabi, Hadith 2706, Alam-ul-Kutub, Beirut, 1998)