Tawheed is the most important Islamic belief. It implies that everything in existence originates from the one and only Creator, who is also the Sustainer and the sole Source of Guidance. This belief should govern all aspects of human life. Recognition of this fundamental truth results in a unified view of existence which rejects any divisions of life into religious and secular. Allah is sole source of Power and Authority, therefore entitled to worship and obedience from mankind. There is no scope for any partnership with the Creator. tawheed tells man that Allah is not born, nor is anyone born of Him. He has no son or daughter. Human beings are His subjects. Linguistically Tawheed means: However, what we are concerned with here is the sharee'ah (shari'ah) or technical meaning of Tawheed, which is: .
Literally Tawheed means "unification" (making something one) or "asserting oneness", and it comes from the Arabic verb (wahhada) which itself means to unite, unify or consolidate. However, when the term Tawheed is used in reference to Allah (i.e. Tawheedullaah), it means the realizing and maintaining of Allah's unity in all of man's actions which directly or indirectly relate to Him. It is the belief that Allah is One, without partner in His dominion and His actions (Ruboobeeyah), One without similitude in His essence and attributes (Asmaa wa Sifaat), and One without rival in His divinity and in worship (Ulooheeyah 'Ebaadah). These three aspects form the basis for the categories into which the science of Tawheed has been traditionally divided. The three overlap and are inseparable to such a degree that whoever omits any one aspect has failed to complete the requirements of Tawheed. The omission of any of the above mentioned aspects of Tawheed is referred to as "Shirk" (lit. sharing); the association of partners with Allah, which, in Islamic terms, is in fact idolatry.
Shaykh Al-Bayjowree - may God have mercy on him - said: Shaykh al-Ghunaymaan - may God protect him - said: Shaykh 'Abdul-Qaadir al-Jeelaanee - may God protect him - said: Ibn Abil-'Izz - may God be pleased with him - said: .
And Tawheed - with the Salaf and the Scholars of Ahlus-Sunnah wal-Jamaa'ah has three divisions. 'Allaamah as-Safaareenee - may God's mercy be upon him - said:
"So Tawheed ar-ruboobiyyah (rububiyyah) implies: A firm and definite belief that Almighty God alone is the Creator, the Master and Owner, and the Command is for none but Him. And Tawheed al-uloohiyyah (uluhiyyah) is to single-out God alone for all worship and not to worship anything along with Him, whether it be an angel, a Messenger, a prophet, a pious person, a tree, a stone, the sun, the moon, or other than these. And Tawheed al-asmaa' was-sifaat (asma was-sifat) is the uniqueness of Almighty God - the Most High - with regards to His Names and His Attributes, by affirming that which God has affirmed for Himself - whether in His Book (i.e. the Qur'an) or by the tongue of His Messenger - may the peace and blessings of God be upon him - without Tahreef (distorting the Names and Attributes), Ta'teel (denial of the Names and Attributes), Takyeef (saying how they are), or Tamztheel (making any resemblance with the creation)."
The one who does not call to Tawheed and the correction of the Aqeedah, is like the one ...... Jundub Ibn Abdullaah al-Bajaly said, .
Source: Why Tawheed?