This South African traditional song from the singing of the Mooiplaas congregation comes from from the Iona Community publication We Walk His Way. A great strength of music from southeastern Africa is that it usually emerges from communal life, and in singing such songs we unite our sung prayers with those of the people who created them.
To lead it, sing through it once or twice. It's easy enough that folks will start singing with you quickly. Encourage harmony and add leader part once the song is set.
Biblical Reference: Matthew 11:28
Copyright Holder Name: English trans. © 2008 WGRG, Iona Community (admin. GIA Publications, Inc.)
Print Source: We Walk His Way, Iona Community, WGRG
Publisher Name: GIA Publications, Inc.
Year of Publication: 2008
Here is a link to a pdf of sheet music for this song.
Here's a recording of the song being sung (disclaimer: this is not an official MMC video):
Composed by John Bell, published in We Walk His Way from Wild Goose publications (available as a CD or songbook).
Here's a video of AnnaMarie Hoos leading Come O Lord and Set Us Free at Music that Makes Community at the Bishop's Ranch in January of 2015.