Musannaf Ibn Abi Shayba 36:447

Ali ibn Mushir narrated to us, from al-Ajalh, from al-Sha’bi, who said: When the news of the killing of Ja’far ibn Abi Talib reached the Messenger of Allah (may Allah bless him and grant him peace), the Messenger of Allah (may Allah bless him and grant him peace) left his wife, Asma bint Umays, until she had shed her tears and some of her grief had departed. Then he went to her and consoled her, and he called for the sons of Ja’far and prayed for them. He prayed for Abdullah ibn Ja’far that he be blessed in the transaction of his hand, so he would not buy anything except that he made a profit in it. Asma said to him, "O Messenger of Allah, these people claim that we are not among the Muhajirin (emigrants)." He said, "They have lied. You have the Hijra twice: you emigrated to the Negus, and you emigrated to me."