The track is the lead single from the band's second studio album Babel, which will be released on September 24.
The song includes the lyrics: "Well I came home, like a stone, and I fell heavy into your arms."
The band said of the follow-up to 2009's Sigh No More: "We are more than excited to release Babel into the world. We had started writing new songs well before we got into the studio to record.
"At first, we peeled ourselves off the road quite reluctantly. We love playing live, obviously, but it had also become an important part of our creative process, we had been writing and rehearsing in soundchecks, and sort of 'road-testing' new songs on our very gracious audiences."
The LP will contain a total of 12 tracks, including 'Whispers in the Dark', 'Ghosts That We Knew', 'Hopeless Wanderer' and the album's title track.
Mumford & Sons were recently added to the lineup of this year's iTunes Festival. They'll perform at London's Roundhouse on the same day that Babel is released (September 24).