It was now about noon, and darkness came over the whole land until three in the afternoon, for the sun stopped shining. And the curtain of the temple was torn in two. Luke 23:44-45

            The curtain in the temple divided the holy of holies, the inner sanctum of the temple where God lived, and the sacrificial area.  Only a high priest, once a year, could enter that room on the Day of Atonement, when all sins were atoned for (spoken for) and every believer received a clean slate.

            When Jesus died on the cross, all atonement occurred for all who believed.  God would not be housed in a temple any longer, but in the hearts of all believers into whom the Holy Spirit would now live (day of Pentecost).  Basically, the temple became useless.  God moved out having completed what the temple always pointed towards—God coming to earth to die for our sins.