On Sunday, May 15, 2016, the Feast of Pentecost, His Excellency, Mar Shlemun Warduni celebrated his first Mass at St. Peter Cathedral. The new Apostolic Administrator arrived the day before to fulfill his duty to the Chaldean Catholic Diocese of St. Peter the Apostle until a permanent Bishop is selected. During his homily, Mar Shlemun highlighted much of what he said the day before at his welcoming, speaking of his desire for unity and his joy at being in San Diego. He also re-iterated his invitation that anyone with a concern is welcome to come and see him. He closed his homily by touching on the Feast of Pentecost and that we should rely on the Holy Spirit in our lives and especially during this transition.