What Halacha do you learn out from Billam?
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When Billam was to curse the Jews he had a second to curse them. How was he able to curse them? Tosfos provides two answers. One he would say let them be cursed, second answer would be, if you start at the time of anger even if you keep going afterwards it still counts since you started at the proper time.This Halacha applies to Davening too.That is, if it is minutes before the end of Zman Teffilah, and you wont be able to finish Davening before the Zman is over the Magen Avraham says you say a Teffilah Ktzarah a shortened version of Davening. There are those who poskin as brought by the Aruch Hashulchan and others that if you start within the Zman when you are allowed to Daven the Teffilah is still good even if goes past Zman teffilah.This is a Halacha from Billam.