Sayyiduna Ali bin Abi Talib and Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with them both) both narrate that the Messenger of Allah (peace and blessings be upon him) said: "A promise is a debt."
Sayyiduna Ali (may Allah be pleased with him) added in his narration: "Woe to the one who makes a promise and then breaks it," and he (peace and blessings be upon him) said this three times.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-A'mash except Abdullah bin Muhammad bin al-Ash'ath; Sa'id bin Malik is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الحاء / 3514
Hadith Gradingمحدثین:إسناده ضعيف لضعف حمزة بن داود
Hadith Takhrij«قال الهيثمي: وفيه حمزة بن داود ضعفه الدارقطني «مجمع الزوائد ومنبع الفوائد، ج 4، ص 166»» «أخرجه الطبراني فى «الصغير» برقم: 419، والطبراني فى «الأوسط» برقم: 3513»