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GUILTY OF DISBELIEF
1760
“I (ibn Omar) heard a man say, ‘No, by Ka'ba’, and admonished him saying, ‘Do not swear by anything other than Allah, because I heard the Messenger of Allah, praise and peace be upon him, say, ‘Whosoever swears by anything other than Allah is guilty of an act of disbelief, or of associating something with Allah.’"
Tirmidhi with a chain up to ibn Omar who related that the Messenger of Allah, praise and peace be upon him, said this.
PROHIBITION OF KNOWINGLY TAKING A FALSE OATH