Tradition 12

وَ صَلاة فَرِيضَة تَعـدِلُ عِنـدَالله اَلـفَ حِجّة وَ اَلـفَ عُمـرَة مَبرُوراتٍ مُتُقَبِّلاتٍ.

The Holy Prophet (S) said: An obligatory prayer, with Allah, is equivalent to one thousand Hajj pilgrimages and one thousand Umrah performances (voluntary pilgrimages to Ka'ba) which are right and accepted.”