Etymology From Middle English herken, herkien, from Old English *hercian, *heorcian, *hiercian, from Proto-West Germanic *hauʀikōn, *hauʀukōn, derived ultimately from Proto-Germanic *hauzijaną (“to hear”) + formative/intensive -k (see also the related hīeran, whence English hear). Equivalent to hear + -k. Cognate with Scots herk (“to hark”), North Frisian harke (“to hark”), West Frisian harkje (“to listen”), obsolete Dutch horken (“to hark, listen to”), Middle Low German horken (“to hark”), German horchen (“to hark, harken to”).
But harke, I heare the footing of a man.c. 1596–1598 (date written), William Shakespeare, “The Merchant of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act V, scene i], page 182:
Hark! the herald angels sing / Glory to the new born King1739, Charles Wesley, George Whitefield, “Hymn for Christmas-Day”, in Hymns and Sacred Poems:
2 more examples
"Hark! The thunder becomes less muttering. It is nearing us, and nearing the earth, too. Hark! One crammed crash! All the vibrations made one by nearness. Another flash. Hold."1856, Herman Melville, The Lightning Rod Man:
Loud voices and a renewed uproar were raised in front of the boarding-house[…] "'Tis Missis Murphy's voice," said Mrs. McCaskey, harking.1906, O. Henry, “Between Rounds”, in The Four Million:
Etymology From Middle English herken, herkien, from Old English *hercian, *heorcian, *hiercian, from Proto-West Germanic *hauʀikōn, *hauʀukōn, derived ultimately from Proto-Germanic *hauzijaną (“to hear”) + formative/intensive -k (see also the related hīeran, whence English hear). Equivalent to hear + -k. Cognate with Scots herk (“to hark”), North Frisian harke (“to hark”), West Frisian harkje (“to listen”), obsolete Dutch horken (“to hark, listen to”), Middle Low German horken (“to hark”), German horchen (“to hark, harken to”).