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
Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) said: "On the day of (the Battle of) the Trench, I and Sayyiduna Umar bin Abi Salamah (may Allah be pleased with him) were with the women in the fortress of Hassan (bin Thabit). Sometimes he would bend down for me and I would look (out from above), and sometimes I would bend down for him and he would look."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8238