Al-Baqarah · 2:248

248. Their prophet said to them that the mark of his being truly chosen as their king was that Allah would return to them the Ark. This was a chest revered by the Israelites which was taken away from them. In it there was tranquillity and relics left behind by the family of Moses and Aaron, such as the staff and a few tablets. In that there is a clear sign if you are true believers.