כִּֽי־יִהְיֶ֤ה בְךָ֙ אִ֔ישׁ אֲשֶׁ֛ר לֹא־יִהְיֶ֥ה טָה֖וֹר מִקְּרֵה־לָ֑יְלָה וְיָצָא֙ אֶל־מִח֣וּץ לַֽמַּחֲנֶ֔ה לֹ֥א יָבֹ֖א אֶל־תּ֥וֹךְ הַֽמַּחֲנֶֽה׃
Cuando hubiere en ti alguno que no fuere limpio por accidente de noche, saldráse del campo, <span class="x" onmousemove="Show('perush','Este es el <b>78vo Precepto Negativo</b> enumerado por el Rambam en el Prefacio a Mishné Torá, su “Compendio de la Ley Hebrea” para todo el Pueblo de Israel.',event);" onmouseout="Close();">y no entrará en él</span>.
Shaarei Teshuvah
“Be on your guard against anything bad” (Deuteronomy 23:10). They, may their memory be blessed, explained (Ketuvot 46a), “A person should not think [impure] thoughts by day and thereby come to impurity by night” - and even though his thought is not to [follow it up with action]. And it is something learned from its [context]. As after it, it is written (Deuteronomy 23:11), “If anyone among you has been rendered unclean by a nocturnal emission.”