Nedarim 40: The Healing Powers of Visiting the Sick
The sages falling ill and getting visitors. Including when nobody visited R. Helbo. But how curative are such visits! And how much harm does one do when not praying for another's recovery. Plus, Rava gets sick and wants to keep it quiet. Until he finally agrees - go out and announce it, and let them pray (or rejoice). Also, the Shechinah visits the sick too. Plus, a question of whether the visitor sits, stands, sits on the floor, etc. - in the presence of God, as the Shechinah is visiting too. Plus, a sidebar on rain and mikvaot, and the given lands.