Jami` at-Tirmidhi 1804

Narrated Al-Mu'alla bin Rashid: "My grandmother, Umm 'Asim narrated to me - and she was the slave woman of Sinan bin Salamah - she said: 'Nubaishah Al-Khair entered upon us while we were eating from a large bowl. He narrated to us that the Messenger of Allah (ﷺ) said: "Whoever eats from A Qas'ah, then licks it, the Qas'ah will seek forgiveness for him." [Abu 'Eisa said:] This Hadith is Gharib, we do not know of it except through the narration of Al-Mu'alla bin Rashid. And Yazid bin Harun and others among the A'immah reported this Hadith from Al-Mu'alla bin Rashid