Fiqh-us-Sunnah Volume 1, Purification and Prayer, Fiqh 1.016.

Section : It is not proper for one to carry something that has Allah’s name upon it while he is going to the bathroom.

It is not proper for one to carry something that has Allah’s name upon it (unless he is afraid of losing it or having it stolen), while he is going to the bathroom. Anas related that the Messenger of Allah, upon whom be peace, had a ring engraved with Muhammad Rasool-ullah, (Muhammad the Messenger of Allah), which he would remove when he went to the bathroom. Ibn Hajr says that this hadith is malul (a type of weak hadith having a defect) and Abu Dawud says it is m unkar, (singularly related by people who are not trustworthy). The first portion of the hadith is authentic, however.