In the Jerusalem Temple, there was a massive veil - a thick curtain that separated the Holy of Holies (where God's presence dwelled) from the rest of the Temple.
Only the High Priest could enter, and only once a year on the Day of Atonement.
This veil represented the separation between God and humanity because of sin. It said: "You cannot approach God on your own. You need a mediator. Stay back."
For 1,500 years, that veil hung there as a constant reminder that humans couldn't just waltz into God's presence.
Then Jesus died.
Matthew 27:51 records what happened at the exact moment of Jesus's death: "At that moment the curtain of the temple was torn in two from top to bottom."
From top to bottom.
Not bottom to top - which would suggest human hands tore it. From TOP to BOTTOM, meaning God Himself ripped it open.
In that moment, God was declaring: "The separation is OVER. The barrier is GONE. Through Jesus's sacrifice, the way into my presence is now OPEN to anyone who believes."
No more …More

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The curtain was torn as Christ died, and the old covenant was no more.