Megachurch pastor Jack Graham was in the middle of his Sunday message to Prestonwood Baptist Church in Plano, Texas, this past weekend when he paused to cue up an unusual sermon illustration. After encouraging people to respond to the killing of conservative Christian activist Charlie Kirk by turning to God, he instructed the congregation to listen to a roughly minute-long audio clip of what sounded like Kirk delivering a short speech.

“Hear what Charlie is saying regarding what happened to him this past week,” Graham said.

As the clip, which encouraged listeners to “pick up your cross, and get back in the fight,” ended, the congregation burst into applause. A few seconds later, they rose to their feet in a standing ovation.