Kol HaMispallel, b'mkom hazeh b'Yerushalayim
Ke'ilu hispallel lifnei Kisei HaKovod,
She'shar hashamayim, hashamayim shom hu
U'pesach posu'ach l'shmaya tefillah
"Whosoever prays in Jerusalem is considered as if he prayed before the Throne of Glory, for the gate of heaven is open there to receive the prayer" --Pirkei de Rabbi Eliezer, circa 800 C.E.