After the Ark of the Covenant was returned to the Israelites by the Philistines, the people of Beth-shemesh looked inside it out of curiosity, which resulted in severe consequences as many of them were struck dead by the Lord. This event serves as a reminder of the holiness and reverence due to God's presence symbolized by the Ark. It underscores the importance of approaching God with awe and respect, acknowledging His sovereignty and power. The tragic outcome reveals the danger of treating sacred things casually or irreverently, emphasizing the need for humility and obedience in our relationship with God.