Urwah narrated: Among the names of those who made the first emigration to the land of Abyssinia: Sayyiduna Abu Salamah bin Abd al-Asad (may Allah be pleased with him), and with him was his wife Sayyidah Umm Salamah (may Allah be pleased with her). She gave birth in the land of Abyssinia to Sayyiduna Umar bin Abi Salamah (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8237