A:
Just entering and exiting the toilet does not invalidate Wudu', because none of the invalidations of Wudu' occurred. There are other matters that are known to invalidate Wudu', such as urinating or defecating, the discharge of any impure substance emitted from the body in a relatively large quantity, (Part No. 4; Page No. 126) sleeping and eating camel meat.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.