6. The hijab is Eemaan (Belief or Faith)

Allah (subhana wa'atala) did not address His words about the hijab except to the believing women, Al-Mo'minat. In many cases in the Qur'an Allah refers to the "the believing women". Aisha (Radhi Allahu Anhu), the wife of the prophet (Salla Allahu ta'ala 'alayhi wa Sallam), addressed some women from the tribe of Banu Tameem who came to visit her and had light clothes on them, they were improperly dressed:
"If indeed you are believing women, then truly this is not the dress of the believing women, and if you are not believing women, then enjoy it."