Asher yatzar (Hebrew: בִּרְכַּת אֲשֶׁר יָצַר "Who has formed man") is a blessing in Judaism.
[3] Though recited normally by observant Jews each time excretory functions are used, it is also recited during the Shacharit service due to its spiritual significance (to Jews, humans are made in God's image, so it is an expression of awe toward God's creations).
[3] The obligation to recite a blessing upon leaving the bathroom could be traced to the following passage in Berachot (60b):[4] One who enters a latrine should say [to the ministering angels who accompany him], "Be honored, honored and holy ones who serve the Most High!
When he comes out, he says, "Blessed... who has formed man with wisdom and created within him many openings and hollow spaces.
After completing urination or defecation and upon leaving the bathroom, the person washes their hands.