(Know they not) i.e. the disbelievers of Mecca (that Allah enlargeth providence for whom He will) that Allah expands wealth to whomever He will as a lure to perdition, (and straiteneth it (for whom He will)) out of care for them. (Lo! Herein) in expanding and straitening provision (verily are portents) signs and admonitions (for people who believe) in Muhammad (pbuh) and in the Qur'an.