It was included on the recording "Sing People of God" released by Franciscian Communications in the USA in 1967 (ref).
It was included in the Nigerian Catholic Hymn Book, but does not appear by be in any other in-print books.
No sources of sheet music have been found, The set of guitar chords provided below are one person's interpretation, but seem likely given the tune in the video. They suggest that the song is in the key of Em.
LyricsThe lyrics are copyright so cannot be reproduced here. But they are currently available on this website.
The song has three verses - with a lot of repeated phrases inside each verse. A rough outline is:
1 We are one in Jesus, all of us are one ...
2 All of us are brothers, brothers of the Lord ...
3 Jesus is our brother, Christ and we are one ...