Shahdah ( Oneness Of ALLAH )

Belief in the oneness of Allah is the most important article of faith. Oneness of Allah means Tauheed, which is the foundation of Islam. Thus, the Quran mentions this belief as an act of righteousness in Surah al-Baqarah:
“It is righteousness to believe in Allah…..” (2:177)
God alone is the Supreme Being of this universe. He is the one and the only to be worshipped as there is no god but Allah. The Quran in many places testifies this fact:
“There is no god but He” (2:255)
“Worship God! You have no other god but Him” (7:59)
God is unique and matchless in nature, person and attributes. As for the nature and person of God, we simply can not imagine as it is beyond our comprehension. Many Surahs mentions this unique nature of God, such as, (2:255), (42:11) but Surah al-Ikhlas best sums up this:
“Say, He is Allah the one, Allah the eternal, the absolute. He beget not, nor is he begotten and there is no one like Him” (112)
By believing in the oneness of Allah and Muhammad (pbuh) as his last messenger, a person enters the folds of Islam:
 “There is no god but Allah and Muhammad (pbuh) is the messenger of Allah”
God is the Creator and Sustainer of all known and unknown worlds. He alone is the king and Lord of the entire universe as He needs no assistance in maintaining this unbounded domain. Surah al-Nas mentions:
“Say I seek refuge with the Lord of mankind, the King of mankind, the god of mankind” (114:1-3)
God’s knowledge is unlimited and infinite. He has knowledge of all time. He knows everything that is hidden, as the Quran states:
“He knows whatever is on the earth and in the sea. Not a single leaf falls but with His knowledge” (6:59)
God is ever living (immortal) and is free from the clutches of time and space. The Quran in this regard says:
“He is the first and the last” (57:3)
The Jews and the Christians believe that Harzat Isa was the son of Allah, but the fact is the God has no family tree or progeny. He has no ascendants, descendents or consorts. The Quran proves this:
 “How can He have a son when He has no consort” (6:101)
It is also believed by Muslims that God alone is the source of mercy and guidance, as mentioned in Surah al-Fatiha. He is the sole source of help and protection, as Surah 113 and 114 mention God’s refuge (help/protection) against external and internal evil. God has the power to bring an end to time and make us all stand accountable before Him:
“Master of the Day of Judgement” (1:4)
Thus, this article is the core of all Islamic teachings; any form or degree of associating partners with God is called ‘Shirk’, which is the only unpardonable sin, as mentioned in (4:48). The Holy Prophet (pbuh) himself said:
“Shirk is the greatest of all sins” (Hadith)