Ps-Clem Hom 11.278:23 :ܠܘܬ ܐܢܬܬܐ ܒܟܦܣܐ ܠܐ ܢܫܬܘܬܦ‏ : he must not have intercourse with a woman in menstruation
See the entire entry for kp̄es, kep̄sā n.m. menstruation