[Joseph Smith Diary] Sunday, July 30th Joseph sick. Lungs oppressed &c., over heated preaching one week before. ... Willard Richards was appointed gen[eral] Church Recorder... Joseph called Hyrum Smith, W[illia]m Law, and W[illard] Richards to lay on hands and pray for him.
[Source: Faulring, Scott (ed.), An American Prophet's Record: The Diaries and Journals of Joseph Smith: Joseph Smith Diary, 1843-44, http://amzn.to/jsdiaries]