Musnad Abu Ya'la al-Mawsili 247:20

Ibrahim ibn Sa'id narrated to us, Yunus ibn Muhammad narrated to us, he said: Umm al-Aswad bint Yazid, the freed slave of Abu Barzah al-Aslami, narrated to us, she said: Munyah bint Ubayd ibn Abi Barzah narrated to me, from her grandfather Abu Barzah, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever consoles a bereaved mother shall be clothed with a garment from Paradise."