Bechoros 29: Paying for Mitzvos (part 1) - Paying a Dayan

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If a judge receives payment to judge a din torah his psak is invalidated. The Shulchan Aruch says he is allowed to receive שכר בטלה but it has to be legitimate (he has another job he could be doing).

If a judge does accept payment, does it invalidate his previous dinei torah or only those he adjudicates after receiving payment?

What are the parameters of the prohibition? What if he doesn't receive payment at the time of the din Torah, only later on?

Part two

Part three

Part four

Rabbi Moshe Elefant

Rabbi Moshe Elefant is Chief Operating Officer of OU Kosher and the maggid shiur of the Orthodox Union’s Daf Yomi webcast (whose 1,800 learners a day around the globe make his lectures the most popular Daf in the world). For listeners of the popular Talkline With Zev Brenner radio program, Rabbi Elefant’s name has additionally become strongly identified with the Passover holiday, as he joins the host on air the for the weeks leading up to the holiday to help people with their kashrut questions.