Tanzanian authorities have threatened to shut down churches which mix religion and politics after a cleric criticised President John Magufuli.
The cleric, Zachary Kakobe, used a Christmas sermon to say the country was "turning into a one-party state".
Days later, the Home Affairs Ministry warned religious organisations which dabbled in political issues would have their license revoked.
Critics complain of growing intolerance towards dissent in Tanzania.
Some critics accuse President Magufuli, nicknamed "the Bulldozer", of becoming increasingly authoritarian - a charge he strongly denies.
Several newspapers have been shut down and individuals have been prosecuted for allegedly insulting the president on social media, while last year Tanzanian police indefinitely suspended political protests and rallies, only permitting political campaigning during elections.
The constitution of Tanzania protects freedom of worship - although religious organisations must register for a license with the country's Home Affairs Ministry to operate legally.
But Mr Kabobe, who leads a Pentecostal church in the commercial capital Dar es Salaam, used his Christmas sermon to tell congregants Tanzania was "quietly turning into a one-state rule by systematically banning political activity".
On Thursday, Projest Rwegasira, the permanent secretary in the Ministry of Home Affairs, warned religious leaders talking about political issues "could lead to cancellation of the registration of the concerned religious society", news agency Reuters reports.
He said religious leaders "using their sermons to analyse political issues is contrary to the law".
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