In one narration the wording is: The mother of Abu al-Haytham said: If you would pray for us (it would be a kindness). The Prophet (peace and blessings be upon him) said: Fasting people have broken their fast with you, righteous people have eaten your food, and the angels have prayed for mercy upon you.
Al-Bazzar recorded this narration; Abu Ya'la recorded it with the part about the slave abridged.
Al-Tabarani also recorded it in the same way. All of their chains contain a narrator, Abdullah bin Isa Abu Khalaf, and he is da'if (weak). Abu Ya'la and al-Tabarani have transmitted the wording "Umm al-Haytham", while al-Bazzar has transmitted "the mother of Abu al-Haytham".
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزهد / 18260