Narrated to me Abu Ghassan al-Misma'i: Mu'adh — that is, Ibn Hisham — narrated to us, saying: My father narrated to me, from Yahya ibn Abi Kathir, who said: Abu Qilabah narrated to me, from Thabit ibn al-Dahhak, from the Prophet (peace be upon him), who said: "There is no vow for a man concerning what he does not possess, and cursing a believer is like killing him. Whoever kills himself with something in this world will be punished with it on the Day of Resurrection. Whoever makes a false claim in order to increase [his wealth] thereby, Allah will only increase him in decrease. And whoever swears a false oath of patience..."