A Washington state pastor fatally shot an armed carjacker in a Walmart parking lot — hours after delivering an impassioned sermon about stepping in to help others, reports said.

David George, pastor of the Assembly of God Church in Oakville, Wash., was standing in the checkout line of an area Walmart last Sunday with his wife, daughter and granddaughter when he heard several loud bangs from the back of the store, reported the Washington Post.

The gunman, later identified by police as Tim Day, dashed out of the big box store and tried to carjack a man in the parking lot, the report said.

The driver refused to give up the ride, so Day shot him twice and tried to swipe a second car, according to the report.

“When the driver did not or could not respond to [Day’s] threats, he began to travel in the direction that I thought my family to be,” George said at a press conference after the incident. “At this point, I left cover and moved to intercept the gunman.”

The pastor opened fire, mortally wounding Day, 44, according to reports.

George — who serves as a volunteer firefighter and EMT, in addition to having active-shooter training — then grabbed a first aid kit from his car and helped stabilize a man shot in the chaos until first responders could airlift him to a hospital.

His intervention came just hours after he’d given a Father’s Day sermon to his flock, urging them to take action against evil.

“Lord, don’t let us be content as men to just let life go by, to see the world around us burn,” he said, according to reports. “God, instead help us to get involved.”

Day — a convicted felon with a history including assault and making death threats, according to the Seattle Times — was at the end of a wild crime rampage.

He’d already carjacked one vehicle and attempted to carjack another earlier in the day, wounding people with gunfire along the way, reports said.

The initial gunshots that George had heard in the back of the Walmart were the sounds of Day trying to shoot open a locked ammunition case to load up on more bullets.

George, who came forward Wednesday as the hero, called the experience and his intervention traumatic but necessary.

“The events of last Sunday evening were tragic and shocking from all points of view,” he said. “I acted on Sunday to protect my family and others from the gunman and his display of deadly intent.”