According to Ibn Asaker, the Israelites believed their Ark of the Covenant to be very holy and an important symbol of their history. They carried the Ark even in battle and believed that, because of it, Allah would protect them from their enemies. This belief gave them peace of mind and great courage, and their enemies were terrified by it. Their enemies also believed that it was given special power by Allah. Gradually the Israelites started to ignore Allah's law; evil habits became part of their lives. Allah sent upon them an enemy, the Philistines, who defeated the Israelites, captured their Ark, drove them out of their homes, and took away their children to use or sell as slaves. Their power was broken. They separated from one another and were very disheartened.
Related Quran Ayaaths of this Hadith.
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari