2 Corinthians 1:17 When I therefore was thus minded, did I use levity? or the things that I purpose, do I purpose according to the flesh, that with me there should be yea, yea, and nay, nay? (WBS)

Ephesians 5:4 nor filthiness, nor foolish talking, nor jesting, which are not appropriate; but rather giving of thanks. (See RSV)