More on Lazar House from Infoplease:

• Lazar House - Lazar House or Lazaretto. A house for poor persons affected with contagious diseases. So called ...
• Dictionary of Phrase and Fable: L - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "L"
• John Milton - Paradise Lost: Book X - Thus they in lowliest plight repentant stood Praying, for from the Mercie-seat above Prevenient Grace descending had remov'd The stonie from thir hear