Observing Ribāt (guarding the Muslim frontiers in the cause of Allah) for a day and a night is better than fasting and standing for night prayer for a whole month. If a person dies (while performing Ribāt), he will receive the reward for his righteous deeds perpetually, will receive his provision, and will be saved from the trials of the grave
Salmān al-Fārisi (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: “Observing Ribāt (guarding the Muslim frontiers) for a day and a night is better than fasting and standing for night prayer for a whole month.…