It is reported in the hadith of Umm Salama that the Prophet (peace and blessings be upon him) said

The questioner : It is reported from Umm Salama that the Prophet (peace and blessings be upon him) said: We seek clarification of the meaning of this hadith?

The Shaykh : This hadith is related to the previous discussion, meaning that if a woman visits another woman in her house, even if no men are present, it is not permissible for her to expose the places of her adornment except to the extent permitted by the Shari'ah. However, if there are men present, she must remain in the hijab she wears when walking in the streets. This is the meaning of this threat and warning. There are several narrations and its meaning, in brief, is that she does not expose her 'awrah (part of the body that must be covered) before a Muslim woman. We have established that her entire body is 'awrah except for the places of adornment, which are known locations, and they have become known to you, if Allah wills.