Qatadah (may Allah have mercy on him) narrates from al-Hasan (may Allah have mercy on him) concerning the saying of Allah Almighty, "Do not make Allah the target of your oaths" [Surah al-Baqarah: 224], that he said: Do not swear by Allah; let none of you say: By Allah! I will not maintain ties of kinship, I will not set things right, I will not give charity from my wealth; (rather, in such a case) let him end his oath and give the expiation.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأيمان / 19856