תּלמוד אויף ירמיהו 41:1

In a baraita it was stated If nothing is known about the character of a man or of his ancestors, and the Scripture mentions any one of them in connection with a praiseworthy action, as for instance, “The word of the Lord which came to Zephaniah son of Cushi son of Gedaliah” (Zephaniah 1:1) we may know that he was a righteous man son of a righteous man; and wherever the Scripture mentions any one of them in connection with a reprehensible action, as for instance, “And it came to pass in the seventh month that Ishmael the son [of Netanel] son of Elishama came” (Jeremiah 41:1) we may know that he was a wicked man son of a wicked man.