The Shadow minister for faiths, Janet Daby, has stepped down because of comments about same-sex marriage.
Janet Daby, the Labour MP for Lewisham East, said that registrars who had a religious objection to same-sex marriage should not be forced to conduct them, in the same way that those with objections to abortion are not forced to carry out the procedure.
It is currently illegal for a registrar to refuse to conduct a same-sex wedding.
She said on Friday: "There needs to be something in place that protects people of faith as well as those who think the other way. It is an issue of conscience. It is like people having a choice who for reasons of conscience cannot participate in conducting an abortion," she said.
On Monday she announced her resignation, saying: "I’m proud to support same-sex marriages. On Saturday Labour celebrated 15 years of civil partnerships, and all the progress we’ve made since.
"I sincerely apologise for my misjudged comments on Friday, and have decided to resign as Shadow Faith Minister."
A Labour spokesman said: “Janet Daby has today stood down from her role as a shadow minister.
“We will appoint a replacement in due course.”