Hadith.3707 - It is narrated from Al-Sabbah ibn Sayabah who said
I said to Abu Abdillah (as), "Abdullah ibn Abi Ya'fur instructed me to ask you-when we borrow bread from our neighbors, we sometimes return it smaller or larger in size. Is this permissible?"
Imam (as) said: "We borrow walnuts, sixty or seventy in number, and they may include small and large ones. There is no harm in this."