A Sheffield MP was one of 48 to break the Labour whip and vote against the welfare bill after the party’s amendment failed.
Louise Haigh, MP for Sheffield Heeley, took the action after Labour’s amendment to the bill failed to pass by 208 votes to 308.
The party line was to then abstain on the bill’s vote.
Dennis Skinner, the Labour MP for Bolsover in Derbyshire, also voted against the bill at its second reading on Monday night.
The bill, which was voted through. will cut welfare spending by £12 billion.