A split of 48 MPs caused Labour's reasoned amendment to the welfare bill to lose by 208 votes to 308 votes.
Acting leader, Harriet Harman, ordered the party to abstain on the bill’s vote but dozens of MPs chose to defy the party whip.
The rebel MPs include party leadership candidate Jeremy Corbyn, and London Mayor candidates Diane Abbott, Sadiq Khan and David Lammy.
The main changes proposed by the Government are reducing the household welfare cap from £26,000 to £23,000, abolishing legally binding child poverty targets, cuts to child tax credits, cuts to Employment and Support Allowance, and cuts to housing benefit for young people.
The 48 rebel Labour MPs who voted against the welfare bill:
Sir Gerald Kaufman
Rebecca Long Bailey
Kelvin Hopkins (Teller)
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