Musnad Abu Ya'la al-Mawsili 209:148

Abu Khaythama narrated to us, Affan narrated to us, Hammad bin Salamah narrated to us, Ali bin Zayd informed us, from Shahr bin Hawshab, from Umm Salamah, that the Messenger of Allah (ﷺ) said to Fatimah: "Bring me your husband and your two sons." She said: So she brought them. He cast a Fadaki cloak over them, then he placed his hand upon them and said: "O Allah, these are the family of Muhammad, so place Your prayers and Your blessings upon Muhammad and upon the family of Muhammad; indeed, You are Praiseworthy, Glorious." Umm Salamah said: So I lifted the cloak to enter under it, but he pulled it from my hand and said: "You are upon good."