Hadrat Imam-i Rabbani  says in the 69th letter of the second volume of his Maktubat:
Recently, most people have been slack in performing salat. They have been slighting the tumaninat  and the ta’dil-i arkan  . For this reason, I have to warn you, my beloved ones, about this matter. Listen well! Our Prophet ‘sallallahu alaihi wa sallam’ declared: “The worst thief is the person who steals from his own salat. “
When he was asked, “O Rasulallah! How can a person steal from his own salat?” he said, “By not doing the ruku  and sajda  of the salat properly. “
 tumaninat: see first and second fascicles of Endless Bliss.
 ta’dil al-arkan: keeping the body motionless for a while after becoming calm during and between the various acts in salat.
 ruku: bowing during the prayer of namaz.
 sajda Sajda, (plural, sujud), Prostration to Allah u Ta’ala in the direction of the Kaaba at Makkah. A Muslim is to praise Allah u Ta’ala and glorify him. The position involves having the forehead, nose, both hands, knees and all toes touching the ground together
 Hadrat: title of respect used before the names of great people like and Islamic scholars.
 rukn The fards in namaz are called rukn. Recitation of an ayat, the ruku’, the two sajdas and sitting in the last rak’at are each a rukn.
 umma(t) followers of Muhammad (‘alaihi ‘s-salam); the community, body of believers, of a prophet.