Silsilah as-Sahihah 448 — Dua for entering the toilet and its reason

It is narrated from Sayyiduna Zaid bin Arqam (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, (the devil) is present in the places of purification, so when a person enters the toilet, he should recite this supplication: I seek refuge with Allah from the male and female evil jinn."