The Archbishop of Canterbury has condemned the actions of the Prime Minister following the release of the Sue Gray report.
The 60-page investigation into rule-breaking in Downing Street saw images released of the PM raising a beer at a lockdown birthday party in June 2020.
The PM had previously denied the gathering took place, but the evidence showed otherwise.
The report also found other gatherings took place that breached Covid rules in force at the time.
Most Rev Justin Welby released a series of tweets, disapproving of the PM's behaviour. He said: "Sue Gray's report shows that culture, behaviour and standards in public life really matter.
"We need to be able to trust our national institutions, particularly in times of great trouble. Jesus commands us to serve the most vulnerable and those in need.
"To help achieve this we must recover the principles of mutual flourishing and the common good in the way we are governed. Standards in public life are the glue that holds us together - we need to rediscover them and abide by them."
On Wednesday, Mr Johnson faced calls from one of his own MPs to resign following the damning report.
Julian Sturdy, MP for York Outer, said the PM has shown a "disregard for coronavirus regulations."
He has apologised to the public yesterday for his actions. In a press conference he said: "I am grateful to Sue Gray for her report today and I want to thank her for the work that she has done.
"I also thank the Metropolitan Police for completing their investigation and I want to again begin by renewing my apology to the house, to the whole country for the short lunchtime gathering on the 19th of June 2020, in the cabinet room, which I stood on my place at the cabinet table, which I received a fixed penalty notice.
"I take full responsibility for everything that took place on my watch."