respectively), both died young, and four daughters—Zaynab, Ruqaiya, Umm Kulthum and Fatimah. Some Shia scholars dispute the paternity of Khadija's daughters, as they view the first three of them as the daughters from previous marriages and only Fatimah as the daughter of Muhammad and Khadija. During their marriage, Khadija purchased the slave Zayd ibn Harithah, then adopted the young man as her son at Muhammad's request. Muhammad's uncle Abu Talib and Khadija died in 620 and the Islamic prophet declared the year as Aam al-Huzn ('Year of Sorrow'). Hijrah (migration) to Medina Sawda bint Zamʿah Before he left for Medina, it was suggested by Khawlah bint Hakim that he should marry Sawdah bint Zam'ah, who had suffered many hardships after she became a Muslim. Prior to that, Sawdah was married to a paternal cousin of hers named As-Sakran ibn ‘Amr and had five or six children from her previous marriage. She along with her husband migrated to Abyssinia due to persecution of Muslims by Meccans. Her husband died in Abyssinia and hence Sawdah had to come back to Makkah. There are disagreements in Muslim tradition whether Muhammad first married Sawda or Aisha, but Sawda is usually regarded as his second wife and she was living with him before Aisha joined the household. In one account, he married Sawda in Shawwal, when Sawda was about 55 years old, in the tenth year of prophethood, after the death of Khadija. At about the same period, Aisha was betrothed to him. As Sawda got older, and some time after Muhammad's marriage to Umm Salama, some sources claim that Muhammad wished to divorce Sawda. Some traditions maintain that Muhammad did not intend to divorce her, but only Sawda feared or thought that he would. Ibn Kathir said that Muhammad was worried that Sawda might be upset about having to compete with so many younger wives, and offered to divorce her. Sawda offered to give her turn of Muhammad's conjugal visits to Aisha, of whom she was very fond, stating that she "was old, and cared not for men; her only desire was to rise on the Day of Judgment as one of his wives". While some Muslim historians cite this story as a reason of revelation, citing Quran 4:128, others like Rashid Rida dispute this whole account as "poorly supported", or mursal. Aisha bint Abu Bakr Aisha was the daughter of Muhammad's close friend