She used to testify that the Messenger of Allah ﷺ would perform ablution after eating something touched by fire.
أنها كانت تشهد أن رسول الله ﷺ كان يتوضأ مما مست النار.
Ahmad (26724) and Tabarani in al-Kabir (23/387) both narrated it through Abdul-Aziz bin Muhammad Darawardi, from Muhammad bin Tahlaa, from Abu Salama, from Umm Salama, who related it. Its isnad is hasan because of Abdul-Aziz Darawardi and his teacher Muhammad bin Tahlaa, for the two of them make the hadith hasan.On this subject there are also narrations from Abu Musa Ashari, Abdullah bin Umar, Abu Ayub, Umm Habiba, and others, but there is criticism regarding their chains of transmission.