Definition of "attest"

Dishonour not your Mothers: now attest that those whom you call'd Fathers, did beget you.

1599, William Shakespeare, “The Life of Henry the Fift”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene i]

[W]e have already ſeen many particular facts vvhich are recorded in holy vvrit, atteſted by particular Pagan Authors: […]

a. 1720 (date written), Joseph Addison, “Section III. The Providence of God.”, in The Evidences of the Christian Religion, […], London: […] J[acob] Tonson […], published 1730, subsection VII, page 25

As the Wildlings can attest, there’s already new life even north of the wall, poking up through the ice. Winter only lasts so long.

2019 May 19, Alex McLevy, “The final Game Of Thrones brings a pensive but simple meditation about stories (newbies)”, in The A.V. Club‎

O pardon : since a crooked Figure may / Attest in little place a Million, / And let us, Cyphers to this great Accompt, / On your imaginarie Forces worke.

1599, William Shakespeare, “The Life of Henry the Fift”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act PROLOGUE, (please specify the scene number in lowercase Roman numerals)]

The supplementary bibliography (in Vol. VI) attests to the comprehensiveness of the effort.

1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, page viii

The sacred streams which Heaven's imperial state / Attests in oaths, and fears to violate.

1697, Virgil, “(please specify the book number)”, in John Dryden, transl., The Works of Virgil: Containing His Pastorals, Georgics, and Æneis. […], London: […] Jacob Tonson, […]