Sa'id bin al-Musayyib (may Allah have mercy on him) said: Two brothers from the Ansar shared an inheritance. One of them demanded that it be divided, so the other said: "If you ask me again, I will never speak to you, and all my wealth will be devoted to the Ka'bah." Sayyiduna Umar (may Allah be pleased with him) said: "The Ka'bah has no need of your wealth. Expiate your oath and speak to your brother, for I heard the Messenger of Allah (peace and blessings be upon him) say: 'There is no oath binding on you, and no vow, in disobedience to the Lord, nor in severing ties of kinship, nor in what you do not own.'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأيمان / 20038