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From wiki.

The legislation was introduced to the House of Commons by Labour MP Hilary Benn as the European Union (Withdrawal) (No. 6) Bill on the following day. The Government made clear its opposition to the bill from the beginning, and said that, were it to pass through the House of Commons, the Prime Minister, Boris Johnson, would immediately bring forward a motion under the Fixed-term Parliaments Act for a general election. The bill passed Second Reading by 329 votes to 300.The bill was amended once at the committee stage, by a Stephen Kinnock amendment that would allow the Withdrawal Agreement to be discussed again, which passed as there were not any ‘no’ tellers provided for the division. The bill passed its third reading on the same day, by 327 votes to 299.

The bill then moved to the House of Lords on the same day, and there were suggestions that the bill could be filibustered; unlike in the House of Commons, the House of Lords typically does not restrict the content of debates. The Shadow Leader of the House of Lords, Baroness Angela Smith, tabled a guillotine motion that would allow the bill to clear the Lords by 5pm on Friday 6 September; Conservative peers tabled 102 amendments to the guillotine motion in an attempt to prioritise other parliamentary business over the bill. By 1:30am on 5 September, the Government announced it would discontinue the filibuster and allow the bill to return to the House of Commons, if amended by the House of Lords, for the 9 September sitting.The bill passed Second Reading without a division on 5 September, and passed the Committee, Report, and Third Reading stages unamended on 6 September. The bill received Royal Assent and became law on 9 September 2019, several hours before Parliament was suspended.