Jeremy Corbyn issued a defiant message today as he took part in his last Prime Minister's Question as Labour leader.
The outgoing party boss vowed to keep campaigning for social justice after he hands over the reins.
He is due to step down next month – and had expected to joust with Boris Johnson for the final time next Wednesday.
But Parliament is closing a week early because of the coronavirus crisis – meaning Mr Corbyn's last Despatch Box outing as Leader of the Opposition began at noon today.
The PM offered a generous tribute to his counterpart, telling MPs: “Perhaps I could begin by pointing out that this is the honourable gentleman's last Prime Minister's Questions and it would be appropriate for me to pay tribute to him, his service to the party and indeed the country over the last four years in a very difficult job.
"We may not agree on everything but no one can doubt his sincerity and determination to build a better society."
But Mr Corbyn hit back: “I thank the Prime Minister for his very kind remarks.
“I believe in a decent, socially-just society.
"He was talking as if it was some kind of obituary.
"To let him know, my voice will not be stilled, I will be around, I will be campaigning, I will be arguing and demanding justice for the people of this country and indeed the rest of the world."
Mr Corbyn became Labour leader in September 2015 after sweeping to victory in the race to succeed Ed Miliband, who quit in the aftermath of the party's election defeat.
The veteran socialist and lifelong anti-war campaigner's unusual parliamentary style in the chamber saw him ask questions from ordinary voters – a strategy that divided backbenchers.
He faced a huge front and backbench rebellion in 2016 following the Brexit referendum.
Former Shadow Cabinet Minister Owen Smith challenged him for the leadership, but Mr Corbyn was re-elected by a landslide.
The MP, who was first elected in 1983, faced three Conservative leaders: David Cameron, Theresa May and Boris Johnson.
But while Labour performed better than expected in the 2017 general election, he led the party to its worst defeat for 84 years last December, forcing him to announce his resignation.
Mr Corbyn was Leader of the Opposition for 139 sessions of Prime Minister's Questions, asking 840 questions, according to Labour research.
Backbench MP Neil Coyle, who has been an outspoken critic of Mr Corbyn, tweeted: “Last PMQs for Corbyn.
“Some say he should have gone in December.
“I think he should have gone in 2016.
“We are further behind now than when Labour left office in 2010, letting down those who need us most.
“History will judge him as he deserves: Labour's worst ever leader.”
Mr Corbyn's successor will be unveiled in April 4, with Shadow Brexit Secretary Keir Starmer the runaway favourite to beat rivals Lisa Nandy and Rebecca Long-Bailey.