וְלֹא־תָּבִּיא תוֹעֵבָּה אֶׁל־בֵיתֶׁךָ וְהָּיִּיתָּ חֵרֶׁם כָּמֹהו שַקֵץ תְשַקְצֶׁנּו וְתַעֵב תְתַעֲבֶׁנּו כִּי־חֵרֶׁם הוא.
Nor should you bring an abomination into your house, lest you are to become closed off like it. Rather you shall utterly detest it, and you shall utterly abhor it; for it is to be destroyed. -- Parshas Eikev, Devorim 7:26
In general, as a holy, pure nation we need to keep away improper things far away from us as much as possible. Now, as the Torah reveals to us in this verse, the one place that you need to be extra vigilant to keep pure is your home.
My home:
Hashem protects it and keeps it secure,
And I make sure to keep it _____.