John Trapp on 1 Corinthians 5:11

Verſe 11. Not to keep company] Gr. Not to be mingled with them. [non-Latin text not transcribed] The rivers of Peru, after they have run into the main ſea, yea ſome write 20. or 30. miles, they keep themſelves unmixed the ſalt water: ſo that a very great way within the ſea, men may take up as freſh water,Abbots Geog. 331. Blunts voy. p. 10. as if they were near the land. So, at Belgrade in Hungary where the Danuby and Sava (two great rivers) meet, their waters mingle no more then water and oil, &c. We muſt ſo converſe with the wicked, as that we commingle not, by holding any needleſſe ſociety with ſuch, no not with him that is called a brother, but belies his profeſſion. Yet ſtill muſt we perform to ſuch, though excommunicated, offices of charity, naturall and civill duties, as thoſe of parents toward their children, of children toward their parents, and the like.