Tumaninat And Ta'dil-i Arkan

Hadrat Imam-i Rabbani [1] 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 [2] and the ta'dil-i arkan [3] . 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 [4] and sajda [5] of the salat properly. " At some other time he declared: "Allahu ta'ala does not accept the salat of a person who does not bring his waist into its proper position and remain so for a while in ruku and sajda. " Once, upon seeing a person not doing the ruku and the sajda properly while performing salat, our Prophet 'sallallahu alaihi wa sallam' said, "Aren't you afraid you may die in some other religion than Hadrat [6] Muhammad's 'alaihissalatu wassalam' religion because you perform your prayers of salat in this manner?" Once again, he said, "When performing salat, if you do not straighten up your body completely after the ruku', if your each limb does not rest at its position for a while when you are standing, your salat will not be complete. " Once again, he said, "Unless you sit upright between the two sajdas your salat will remain incomplete. " One day, upon seeing someone not observing the rules and rukns [7] of salat, not standing upright after the ruku' and not sitting between the sajdas, our Prophet 'sallallahu alaihi wa sallam' said, "If you go on performing your prayers of salat in this manner, on the Day of Resurrection you will not be said to be of my Ummat [8] . " At some other time he said, "If you go on in this manner and die, you shall not have died in the religion of Muhammad (alaihissalam). "

[1] imam: i) profound 'alim; founder of a madhhab; ii) leader in congregational salat; iii) caliph.
[2] tumaninat: see first and second fascicles of Endless Bliss.
[3] ta'dil al-arkan: keeping the body motionless for a while after becoming calm during and between the various acts in salat.
[4] ruku: bowing during the prayer of namaz.
[5] 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
[6] Hadrat: title of respect used before the names of great people like and Islamic scholars.
[7] 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.
[8] umma(t) followers of Muhammad ('alaihi 's-salam); the community, body of believers, of a prophet.