CHICAGO — An activist Catholic priest cleared by an Archdiocese of Chicago investigation into claims that he sexually abused several boys decades ago returned to the pulpit of his longtime church on Sunday for the first time in five months.

“It’s good to be home,” Father Michael Pfleger repeatedly told congregants of the Faith Community of St. Sabina, describing his time away during the investigation as a “painful nightmare.”

Pfleger, 72, was placed on leave in January amid allegations from two brothers who said Pfleger sexually abused them as children starting in the 1970s. A third man later also alleged that Pfleger molested him once in 1979 when he was 18. Last month, the archdiocese concluded there was “insufficient reason to suspect” that Pfleger had abused children. A police investigation remains open.

His first service back at the largely Black church on Chicago’s South Side was as spirited as ever, with live music, dancing and reenergized congregants who have fiercely backed their priest. Pfleger, who is white, thanked congregants for supporting him and vowed to resume his activism, especially against gun violence, with even more gusto.

“I’m going to fight harder, because I’m stronger, I’m better and I’m wiser. … The last five months have been a roller coaster of hurt and anger and depression and pain and not knowing what people are thinking about you,” he said, his voice breaking at times.

To support Pfleger, church members have held rallies, flooded archdiocese phone lines, threatened to withhold church dues and launched a letter-writing campaign. On Sunday, some wore T-shirts featuring the priest’s photo and the message “Pfleger is back.” Among those in attendance was filmmaker Spike Lee, who is friends with Pfleger and whose 2015 movie “Chi-raq” featured a character inspired by Pfleger and played by John Cusack.

Pfleger is known for his anti-violence activism and for bolstering neighborhood development in the largely low-income neighborhood surrounding the church. He’s also been in the spotlight for clashing with church leaders, having been suspended twice before this year, including in 2008 during Barack Obama’s presidential campaign when he mocked Obama’s primary opponent Hillary Clinton.

Ordained in 1975 and assigned to St. Sabina, Pfleger became pastor six years later and lived at the nearby rectory until earlier this year, when he temporarily moved to an apartment during the investigation.

Police have said their investigation remains “open and active,” but they haven’t provided any details about it. Cook County State’s Attorney Kim Foxx has said police haven’t presented any information for her office to review or determine if criminal charges are appropriate. Illinois has no statute of limitations for filing charges in major sex crimes.

The Illinois Department of Children and Family Services completed its review in February, concluding there was no credible evidence of child abuse or neglect. The agency, which doesn’t investigate allegations of abuse by an adult victim, focused on whether children were currently at risk.

During Sunday’s service, Pfleger talked about street violence in Chicago. He also acknowledged the damage that the abuse allegations did to his reputation.

He didn’t talk about the allegations in detail, aside from saying the false accusations to “destroy his character” began with an “extortion letter.” One of the brothers, who are in their 60s, has acknowledged that he asked Pfleger for a $20,000 payment in December.

“I know my name will be damaged for the rest of my life,” Pfleger said as congregants booed. “But most of that is by people that hated me anyway. There are people watching today that are not happy that I’m back. But take off your party hat and blow out the candles. I’m back.”