Christian and Jewish followers do not typically observe a pre-dawn meal (Sehri) while keeping a fast. However, there is no strict religious rule that prohibits them from doing so if they choose to.

In Christianity, there are various types of fasting practices, and some may involve abstaining from certain foods or meals. However, there is no specific requirement to observe a pre-dawn meal before fasting.

In Judaism, fasting is observed on specific days, such as Yom Kippur and Tisha B’Av, and typically involves a full-day fast without any food or water. However, some Jews may choose to eat a small meal before dawn on the day of the fast, known as the “seuda hamafseket,” which is intended to help sustain them through the day.

Overall, while Christian and Jewish followers do not typically observe a pre-dawn meal while fasting, there is no religious rule that prohibits them from doing so. It ultimately depends on the individual’s personal choice and the specific fasting practice being observed.