(And when a token cometh unto them) when a verse comes down from heaven informing of what al-Walid Ibn al-Mughirah, 'Abd Yalayl and Abu Mas'ud al-Thaqafi were doing, (they say: We will not believe) in this verse (till we are given) the Scripture like (that which Allah's messengers are given) meaning Muhammad (pbuh). (Allah knoweth best with whom to place His message) He knows best to whom He sends Gabriel with His message. (Humiliation) degradation and abasement (from Allah and heavy punishment will smite the guilty) the idolaters, i.e. al-Walid and his friends (for their scheming) for their denial of the messengers.