Can the mutakif leave the masjid to wash his hands for eating?
Answer:
It is not permissible for the mutakif to leave the masjid to
wash his hands for eating. One can ask someone to bring a bowl of water to wash
his hands. (Ahsanul Fatawa p.502 v.4)
However, if a person leaves the masjid with the intention of
doing wudhu, then whilst doing the wudhu he can wash his hands. (Ahsanul Fatawa
p.500 v.4)