pesachim 111

beware the beginning of the month
beware of women at the beginning of their time of the month,
beware of the dangerous shadows, and the demons who lurk in multi-branched trees,

most importantly: get to know the demons and then you can write the correct amulets

(this page of Talmud reads like a strange encyclopedia of demons and dangers. sleeping in shadows, walking between trees, women. a woman walking between men, especially during the beginning of her period.... demons are everywhere, in trees, in breadcrumbs, in food under the bed)