Tauhid means to believe in Oneness of Allah.
Tauhid has three aspects :
A. Oneness of the the Lordship of Allah ; Tauhid-ar-Rububiyyah: To believe that there is only one Lord for all the universe,Who is the Creator,Organizer,Planner,Sustainer,and the Giver of security,etc., and that is Allah.
B. Oneness of the Worship of Allah; Tauhid-al-Uluhiyyah: To believe that none has the right to be worshipped ( e.g. praying,invoking,asking for help from the unseen,swearing,offering sacrifice,giving charity,fasting,pilgrimage ) but Allah.
C. Oneness of the Names and the Qualities of Allah: Tauhid-al-Asma'was-Sifat: To believe that :
1. We must not name or qualify Allah except with what He or His Messenger may Allah exalt his mention,has named or qualified Him;
2. None can be named or qualified with the Names or Qualifications of Allah; e.g Al-Karim;
3. We must believe in all the qualities of Allah which Allah has stated in His Book ( The Qur'an ) or mentioned through His Messenger may Allah exalt his mention, without changing their meaning or ignoring them completely or twisting the meanings or likening th(giving resemblance ) to any of the created things e.g Allah is present over His Throne as mentioned in the Qur'an ( V.20:5) :-
"The Most Gracious ( Allah ) rose over ( Istawa ) the (Mighty) Throne ( in a manner that suits His Majesty )," over the seventh heaven; and He comes down over the first ( nearest ) heaven to us on the day of 'Arafah ( Hajj,i.e the 9th of Dhul-Hijja ),and also during the last third part of the night as mentioned by the Prophet may Allah exalt his mention, but He is with us by His Knowledge,not by His Personal-Self (bi-Dhatihi)
(It is not as some people think that Allah is present everywhere-here,there ans even inside the breasts of men).
