Hijab

"To those who say the term 'hijab' is not explicitly mentioned in the Qur'an and thus it cannot be fard, ask them: what then about the fact that the words 'Asr,' 'Maghrib' and 'Ishaa' are not explicitly mentioned in the Qur'an?"

Paraphrasing from Ustadh Suhaib Webb's lecture at MCA (07/30/2007)