Pathamajjhana …. Concentration
Quite secluded from sense pleasures, secluded from unwholesome states of mind, he enters and dwells in the first jhana, which is accompanied by applied thought and sustained thought with rapture and happiness born of seclusion. (M.i,1818; Vbh.245)
From: “The Jhanas in Theravada Buddhist Meditation”, by Henepola Gunaratana. Access to Insight (BCBS Edition), 30 November 2013, http://www.accesstoinsight.org/lib/authors/gunaratana/wheel351.html .