Silsilat al-Ahadith al-Sahihah

Sayyiduna Abdullah bin Umar (may Allah be pleased with them) says that I heard the Messenger of Allah (peace and blessings be upon him) say: "Swearing an oath by anyone other than Allah is shirk (associating partners with Allah)."

Ibn Buraidah narrates from his father, who says: The Messenger of Allah (peace and blessings be upon him) said: "Whoever swears by trust is not one of us."

Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates that the Noble Prophet (peace and blessings of Allah be upon him) said: "Swear by Allah, fulfill it, and speak the truth, for Allah dislikes swearing by other than Him."

A woman from the tribe of Juhaina, Sayyida Qateela bint Saifi (may Allah be pleased with both of them), says: A Jewish scholar came to the Prophet Muhammad (peace and blessings be upon him) and said: "You people commit shirk; you say: (It happens) as Allah wills and as you will. And you also say: By the Ka'bah." The Messenger of Allah (peace and blessings be upon him) said: "You should say: (It happens) as Allah wills and then as you will, and when taking an oath, say: By the Lord of the Ka'bah."