We pray behind the place where Abraham stood out of appreciation to him.
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Circumambulating arround the Ka`ba is followed by offering two units of prayer. It is recommended to offer this prayer after the standing place of Abraham towars the Ka`ba direction.
Allah said ( interpretation of the meaning ) :
{ And [mention] when We made the House [i.e., the Ka’bah] a place of return for the people and [a place of] security. And take, [O believers], from the standing place of Abraham a place of prayer. And We charged Abraham and Ishmael, [saying], "Purify My House for those who perform ‹Tawaf1 and those who are staying [there] for worship and those who bow and prostrate [in prayer]." }
Quran ( 2 : 125 )