The fourth question of Fatwa no. 8598
Q 4: Does rolling up the sleeves count as part of the tucking up that is not allowed during Salah?If it is part of that tucking up, does the ruling differ if I start praying with my sleeves rolled up, meaning, I do not roll them up during the Salah, or does it make no difference?
A: It is not permissible to roll up the sleeves or to fold them up before the Salah or during it to avoid that they will touch the ground when performing Sujud (prostration), because the Prophet (peace be upon him) said, I have been commanded to pray on seven bones and not to tuck up my hair or my clothes. [Narrated by Al-Bukhari and Muslim].
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.
The Permanent Committee for Scholarly Research and Ifta’
Chairman : Shaykh Abdul-`Aziz ibn `Abdullah ibn Baz
Source : http://www.alifta.net