My master used to give me something and I would feed others from it, so he forbade me, or he said, he struck me. I asked the Prophet ﷺ, or someone else asked him, and I said, "I will not stop," or "I will not leave it."He said, "The reward is shared between the two of you."
حدثنا أبو بكر بن أبي شيبة حدثنا حفص بن غياث عن محمد بن زيد
كان مولاي يعطيني الشيء فأطعم منه فمنعني أو قال فضربني فسألت النبي ﷺ أو سأله فقلت لا أنتهي أو لا أدعه فقال الأجر بينكما
No references are available.
Muslim narrated it in the Book of Zakat, in the chapter "What a Servant Spends from His Master's Wealth," hadith 1025, from Ibn Abu Shayba with this wording.