Genesis 38:1

And it came to pass at that time, that Judah went down from his brethren, and turned in to a certain Adullamite, whose name [was] Hirah.

Ver. 1. And it came to pass at that time.] Before the rape of Dinah, the sale of Joseph, and soon after their return from Mesopotamia.

Judah went down from his brethren.] A green youth of thirteen or fourteen years of age, left his company, where he might have had better counsel. There is a special tie to perseverance in the communion of saints. They that "forsake the assembling of themselves together," axe in a fair way for apostasy. Heb 10:25

To a certain Adullamite.] There is a double danger of evil company. (1.) Infection of sin, - at least, defection from grace. (2.) Infliction of punishment. Rev 18:4