When is praying while sitting an excuse?

[Ansari]

Assalaamu Alaykum,

When are we allowed to pray the entire salah sitting on the ground or a chair?
Is it obligatory to stand the first rak'aat and sit during the remaining rakaats if one cannot stand up without turning away from the qibla (he can only stretch his legs)? Or is it okay when u stay seated from the beginning?
Would this still count for a person who experience some difficulty in standing, or sits after the ruku' with the help of both his hands moving his head away from the qibla a little bit?

Would the prayers have to be repeated when one did not perform salah standing in the beginning, when he had the power to do that and performed the whole prayer sitting because he could not perform sajdah clearly?

I am a bit confused about the conditions:

6. Is it acceptable to offer one's salaat in a mixed fashion, i.e; perform Qiyaam and Ruku in normal fashion, but perform Sajdah and Tashaud while sitting on a chair, because of physical limitations?

6) If a person due to some excuse is unable to perform sajdah on the ground as normal, thern the ruling is that he is excused from making qiyaam. Therefore he should perform his whole salaat in a sitting position. (Shaami vol.1 pg.445).

http://www.askimam.org/fatwa/fatwa.p...f582bea0b7d494

If you cannot stand and perform salaah in your office or anywhere else and you have no alternative then you will be excused for sitting on the chair of your office and performing salaah.

http://www.askimam.org/fatwa/fatwa.p...bd08f15ca4acb5

Since you experience difficulty making sajda, you can sit on the chair and
perform your salaah. You do not have to kneel on the floor. For ruku you
should lower your head and for sajda, you should lower it more.

http://www.askimam.org/fatwa/fatwa.p...9447fffdf606b7

However, if "praying at your desk" means to pray sitting down in your seat and just bowing your head in prostration on your desk, then that is not valid. Standing, facing the qibla, bowing, and prostration are part of the precondition and integrals of salat.


And Allah knows best.

Wassalam

Abdurrahman ibn Yusuf

http://qa.sunnipath.com/issue_view.a...=4576&CATE=147

[Husain]

If the person doesn't have the ability to make sajdah, then he should sit and perform the entire salah, even if he is perfectly able to stand.