Genesis 37:31 Halakhah

וַיִּקְח֖וּ אֶת־כְּתֹ֣נֶת יוֹסֵ֑ף וַֽיִּשְׁחֲטוּ֙ שְׂעִ֣יר עִזִּ֔ים וַיִּטְבְּל֥וּ אֶת־הַכֻּתֹּ֖נֶת בַּדָּֽם׃

And they took Joseph’s coat, and killed a he-goat, and dipped the coat in the blood;