The feather, whence the pen
Was shaped that traced the lives of these good men,
Dropped from an Angel's wing.
Source, in full
Part III, No. 5 — Walton's Book of Lives. Compare: "The pen wherewith thou dost so heavenly sing / Made of a quill from an angel's wing", Henry Constable, Sonnet; "Whose noble praise / Deserves a quill pluckt from an angel's wing", Dorothy Berry, Sonnet