Sir Keir Starmer mocked the unity of the Conservative party in the final Prime Minister's Questions before Parliament breaks for the Christmas holidays.
The Labour leader hit Rishi Sunak with a barrage of festive-themed jibes during the frosty showdown in the Commons on Wednesday.
Referring to the bitter splits that had emerged among Mr Sunak's MPs over the Rwanda Bill, Sir Keir said: "Christmas is a time of peace on earth and goodwill to all - has anyone told the Tory Party?"Mr Sunak replied: "Christmas is also a time for families, and under the Conservatives we do have a record number of them.
"At the beginning of the year I set out some priorities that this Government would deliver for the British people, and over the course of this year we have.
"Inflation halved, the economy growing, debt falling, action on the longest (waiting lists), the boats down by a third, and crucially... tax cuts coming to help working families in the new year."
Sir Keir ridiculed the PM over comments reportedly made by Tory MPs this week, including that some had called Mr Sunak a "really bad politician". "Apparently he's holding a Christmas party this week. How's the invite list looking?, the Labour leader asked.
When met with jeers from the Conservative benches, Sir Keir said: "They've obviously found the donkey for their nativity, but the search for the three wise men will take a little longer."
He also accused Conservative backbenchers of "pretending to be members of the Mafia" when right wing factions of the party began being referred to as "the five families".
"Nearly 140,000 children are going to be homeless this Christmas, that is more than ever before, that is a shocking state of affairs and it should shame this Government," Sir Keir said.
"Instead of more social housing, house building is set to collapse. Instead of banning no fault evictions, thousands of families are at risk of homelessness.
"Rather than indulge in his backbenchers swanning around in their factions and their star chambers pretending to be members of the Mafia, when is he going to get a grip and focus on the country?"
In response, Prime Minister Rishi Sunak hit back: "Rough sleeping in this country is down by 35 per cent thanks to the efforts of this Government, hundreds of thousands of fewer children in poverty today thanks to this Government.
"And when it comes to home building again... we just had the data this last week, within the last year an almost record number of new homes delivered, more than in any year of the last Labour government."
