There is a teaching going around that when the High Priest finished the final Passover sacrifice, he would say ‘it is finished’, and that this was at the same time as Jesus’ final words.

While a Jewish understanding of the Passover offers us many rich insights into the final hours of Jesus on earth, there is no record in Jewish writings or tradition of the High Priest having this custom. For more details see

FFOZ are by the way a very very good resource for deep diving into the Jewish background of the NT.