The Holy Prophet of Islam (peace be upon him and his progeny) said:
اِذا حَدَّثَ الرَّجُلُ بِحَديث، ثُمَّ الْتَفَتَ فَهِىَ اَمانَةٌ
When somebody says something and looks around himself, his speech is a trust and secret (and we shall try to keep it).1
Trust has different forms in Islam, including faithfulness in keeping people’s secrets. This is considered so important in Islam’s view that disclosing a person’s secret is considered as one of the capital sins. Moreover, for something to count as a secret, it is not necessary that the speaker has said that it is a secret and requested that it be kept a secret. Rather, the least sign or hint is sufficient for understanding this reality. If , before speaking, somebody looks around himself to see if another person is within hearing distance, this would be adequate to give rise to the trust so that it becomes obligatory to treat what he says as a secret of a Muslin brother.