«لا نذر لابن آدم فيما لا يملك ولا يمين له فيما لا يملك ولا طلاق له فيما لا يملك»
The Prophet (peace and blessings be upon him) said:
"The vow of the son of Adam is not valid regarding what he does not own, his oath is not valid regarding what he does not own, and his divorce does not take effect regarding what he does not own."
Hadith Referenceصحیح الجامع الصغیر / حرف اللام ألف / 7548