Then the curtain hanging in the Temple was torn in two from top to bottom. The earth shook, the rocks split apart...
Matthew 27:51

At Jesus' death, the massive, thick curtain in the temple in Jerusalem ripped in two. This curtain sealed off the Most Holy Place. No one except the high priest was allowed into the presence of God in that Most Holy Place. And the high priest was permitted in only once a year, on a special day. The author of Hebrews looked on the miraculously torn curtain as symbolic, signifying the immediate access to God made possible by Jesus' death.

Hebrews 10:19-20