Sahih Muslim | Book 15 | Chapter 4

Narrated by Abu Haraira
Abu Haraira reported Allah's Messenger (may peace be upon him) as saying: Your oath should be about something regarding which your companion will believe you. 'Amr said: By which your companion will believe you.

Narrated by Abu Huraira
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: An oath is to be interpreted according to the intention of the one who takes it.