וַיֵּ֣דַע אוֹנָ֔ן כִּ֛י לֹּ֥א ל֖וֹ יִהְיֶ֣ה הַזָּ֑רַע וְהָיָ֞ה אִם־בָּ֨א אֶל־אֵ֤שֶׁת אָחִיו֙ וְשִׁחֵ֣ת אַ֔רְצָה לְבִלְתִּ֥י נְתָן־זֶ֖רַע לְאָחִֽיו׃
And Onan knew that the seed would not be his; and it came to pass when he went in unto his brother’s wife, that he spilled it on the ground, lest he should give seed to his brother.
Related passages and parallel verses for Genesis 38:9.