He was speaking at the Labour Party's annual conference church service on Sunday, organised by the group Christians on the Left.
Mr Corbyn described Christians standing against injustice as "the very best" of the Christian faith.
He added: "I thank Christians and other faith communities and faith organisations for the work they do in our communities supporting the vulnerable and oppressed, and my message to you is that the values of solidarity, loving our neighbours, unity in our communities and seeking justice at home and abroad are the values that we hold dear in the Labour Party and will continue to do so."
The service was dedicated to raising awareness and praying for victims of human trafficking and modern day slavery, which is part of International Justice Mission's annual Freedom Sunday campaign.
Mr Corbyn added: "Isaiah chapter 1 verse 17 reads 'Seek justice. Defend the oppressed.' This message is close to my heart as leader of the Labour Party and any Labour government that I lead will have global justice at its heart and we will seek justice for all and defend the oppressed at home and abroad - be they refugees, victims of human trafficking and modern slavery or those living in poverty."
The Labour leader was presented with a Bible at the service which was attended by delegates, members, MPs, and local churchgoers.
The preacher was Baroness Maeve Sherlock, a Labour member of the House of Lords who is also a curate at a church in County Durham.
The service held at ONE Church Brighton.
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