A traditional West Virginian folk hymn sourced from P.W.Gainer’s Folk Songs from the West Virginia Hills (via Pete Sutherland), and adapted for the whistle (or flute, fiddle, etc.). This 6/8 melody was featured on The Piper in the Holler album in the key of E-minor, played on a D-whistle. This particular setting is in the same key. For the version in B-minor (for Scottish-style pipes), please see here. Chord symbols are included in this setting, but not the lyrics to the hymn.
Audio sample from The Piper in the Holler album, featuring the high-D whistle:
(NB: the original hymn would ordinarily be sung at a much slower tempo.)