May I Counter-Sue in Secular Court if a Fellow Jew Sued Me There First?
Question:
If a fellow Jew has brought a claim against me in a secular court, am I allowed to bring a counter-lawsuit against him in the same secular court, or must I first go to Beit Din?
Answer:
The fact that a fellow Jew has transgressed by taking you to secular court without first summoning you to Beit Din is indeed a serious violation of halacha. However, it is forbidden for you to retaliate by also taking him to secular court. Just because he violated halacha does not give you permission to do the same.
Instead, you should summon him to Beit Din in order to stop the secular court proceedings and have him address his claims in a halachically appropriate forum. Once the case is brought before Beit Din, you may then present your counterclaims there.
If necessary, Beit Din may issue a ruling that allows further action, but this must be done under their guidance. Acting independently by counter-suing in secular court without Beit Din authorization is not permitted.
Sources: See Michaber C.M. 26:1; Braisa Gittin 88b; Mahrsham 1:89; P”M O.C. 444 A”A 7; Mishneh Limelech Kilayim 1:6
