Oath

Assalaam Alaikum Mufti Sahab, Is verbal utterance necessary for an oath to be valid or will an oath be formed if a firm intention is made in the heart without saying it loudly with the mouth and tongue? JazakAllah

Oath

Assalaam Alaikum Mufti Sahab, Is verbal utterance necessary for an oath to be valid or will an oath be formed if a firm intention is made in the heart without saying it loudly with the mouth and tongue? JazakAllah

Oath made in the heart

Assalaam alaikum, Will an oath be valid if it is made in the heart without uttering it? JazakAllah