After obtaining Margaret McElhenny Levens’ death certificate which listed her parents as Alexander McElheny and Sophia Hazelet, I found this marriage record in the Historical Society of Pennsylvania’s Pennsylvania Historic Church and Town Records database on Ancestry.com. The below is from the church records of St. Stephen’s Episcopal Church in Philadelphia.
McIlhenney, Alexander & Hazlet, Sophia > married 24th December 1833 by Jas. Montgomery
Original source citation:
Historical Society of Pennsylvania (Philadelphia, Pennsylvania), St. Stephen’s Episcopal Church Births & Marriages, Reel 1079, p. 25, Alexander McIlhenney & Sophia Hazlet, 24 December 1833; digital images, Ancestry.com. Pennsylvania, Historic Church and Town Records, 1708-1985 (http://search.ancestry.com/search/db.aspx?dbid=2451 : accessed 4 January 2013).