Peers have approved a bill designed to stop Boris Johnson's Government forcing through a no-deal exit.
The House of Lords approved the European Union (Withdrawal) (No. 6) Bill at third reading without a formal vote.
It had been passed by MPs on Wednesday, inflicting another defeat in a disastrous week for the Prime Minister.
There had been fears pro-Brexit peers would deliberately hold up the bill so it could not get Royal Assent before Parliament is prorogued (suspended) next week.
Number 10 said the public had to choose between a "deal, no deal or more delay."
The legislation requires a delay to Brexit beyond October 31 unless a divorce deal is approved or Parliament agrees to leaving the EU without one by October 19.
The PM told journalists on Thursday he would "rather die in a ditch" than go to Europe and ask for an extension.
It sailed through its final stages in the Lords without amendment and is now expected to receive royal assent on Monday, thereby completing all stages required to become law.
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Mr Johnson's refusal to be bound by the bill means the PM risks openly defying the law. He has dubbed it the "surrender bill" and claims it stymies Brexit negotiations with the EU by removing the threat of no-deal.
Tory Lord Callanan said it brought "delay and uncertainty" while undermining the Government's attempts to negotiate the withdrawal agreement.
The Liberal Democrat leader in the Lords, Dick Newby, said: "Despite cynical attempts from Tory backbenchers to filibuster, the Article 50 extension bill has seen safe passage through the House of Lords.
"It seems that - unlike our suitcases - their threats of disruption were empty."
The bill had been expected to be completed by 5pm, but it had passed just over an hour earlier.
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