If a person saw the new moon but cannot walk, they may bring him on a donkey, [and] even on a bed. [And] if an ambush awaits them, they may arm themselves with sticks; and if it was a distant journey, they may take food in their hands, since for a journey of a night and a day they may desecrate the Sabbath and go forth to render testimony about the new moon, as it is said: These are the appointed times of HASHEM ... which you shall declare in their fixed time.