And when We made the House (- the Ka`bah at Makkah) a frequent resort for mankind and (a place of) peace and security, and (We commanded), `Take to yourselves the place of Abraham (- the Ka`bah) for a centre (and face towards it) during Prayer.' And We enjoined Abraham and Ismâîl, `Purify and clean My House for those who perform the circuit (around it) and those who cleave to it for devotion and for those who bow down (before Allâh) and prostrate (to Him in Prayer).'