بسم الله الرحمن الرحيم
(Fatwa: 707/438/L=1434)
Doing qiyam (standing) is fardh (obligatory) in fardh and wajib and in the sunnah of Fajr salah. If anyone offers fardh, wajib or the sunnah of Fajr sitting while he is capable to stand then his salah shall not be valid.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
