What is meant by Al-Ribat Fi Sabil

Q 4: How accurate is the following Hadith: "The people of Egypt are in Ribat to the Day of Resurrection." What is the meaning of Ribat?

A: We know of no origin to this Hadith. The meaning of Ribat is: Staying at the Muslim frontiers and paths to defend them against the disbelievers.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.