Unquestionably, they [i.e., the disbelievers] turn away their breasts to hide themselves from him. Unquestionably, [even] when they cover themselves in their clothing, He [i.e., Allāh] knows what they conceal and what they declare. Indeed, He is Knowing of that within the breasts.
These idolaters bend their backs and lower their heads in order to hide from Allah’s Messenger (peace be upon him). When they cover their heads with their clothing so that Allah’s Messenger (peace be upon him) does not see them, turning away from what he brought, Allah knows what they conceal and what they reveal. He knows the intentions that are in the heart. Nothing is hidden from Him.