When Wudhu Is Necessary
Wudhu is necessary before any of the following:
1. Performing Salaah. Making Tawaaf of the Kabah.
2. Carrying or touching the Holy Quraan, or any Ayah of the Holy Quraan when it is not covered by a piece of cloth or in a bag.
3. Making Sajdah-e-Tilaawah.
Copied from "AL-Usataadh"