The Messenger of Allah ﷺ was cupped, and when the cupper finished, he asked him, "How much is your tax?"The cupper replied, "Two saa."So he had one saa reduced from him and instructed me to give him one saa.
حدثنا عبد الله حدثني أبو بكر بن أبي شيبة حدثنا وكيع و حدثنا عبد الله قال و حدثنا سفيان بن وكيع حدثنا أبي عن أبي جناب عن أبي جميلة الطهوي قال
احتجم رسول الله ﷺ ثم قال للحجام حين فرغ كم خراجك قال صاعان فوضع عنه صاعا وأمرني فأعطيته صاعا
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Its isnad is daif. Abu Janab Kalbi is Yahya bin Abu Hayyah, who is daif. Yahya Qattan, Ibn Saad, and others declared him daif. Abdullah bin Ahmad said, on the authority of his father, that his hadiths are munkar. The best that can be said of him is what Ibn Numayr said, that he was truthful (saduq), but was given to tadlis, and his tadlis corrupted his hadith, as he would narrate things he had not heard.The hadith appears in Zawaid 4:94, where it is said that Abu Janab Kalbi is a mudallis, though a group of scholars have deemed him trustworthy. Abu Janab is with a fatha on the jim and a lightened nun. In Zawaid it appears as Abu Habab, which is a printing error. See also 1130 and 2155 of Musnad Ibn Abbas.