This text comes from Songs of Innocence and of Experience (1826), a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Transcription(contributor provided)
The Shepherd.
How sweet is the Shepherds sweet lot
From the morn to the evening he strays;
He shall follow his sheep all the day
And his tongue shall be filled with praise.
For he hears the lambs innocent call,
And he hears the ewes tender reply.
He is watchful while they are in peace,
For they know when their Shepherd is nigh.