Benefit, the Causer of Harm, the Allknowing of everything, and the Omnipotent Who has power over all things. There is no deity but Him, and no Lord but Him.
There are many Ayahs that carry this meaning and they all show that Allah (may He be Praised) possesses the attributes of absolute perfection and is free from any attributes of imperfection or blemish. This entails showing Tawhid and sincerity in 'Ibadah to Allah (may He be Praised), turning one's heart to Him, and putting one's trust in Him in all matters, while associating with Him no other partner, because He is the Creator, the Sustainer, the Owner of everything, the Disposer of all affairs. Accordingly, it is not lawful to worship other than Him.
Allah (may He be Praised) informs us that His Prophets, Nuh, Hud, Salih and Shu'aib said to their people: Worship Allâh! You have no other Ilâh (God) but Him. He also mentions that all the Messengers told the same to their people, as was stated in the above Ayahs.
Allah (Exalted be He) says: And (remember) Ibrâhîm (Abraham) when he said to his people: "Worship Allâh (Alone), and fear Him: that is better for you if you did but know.
"You worship besides Allâh only idols, and you only invent falsehood. Verily, those whom you worship besides Allâh have no power to give you provision: so seek your provision from Allâh (Alone), and worship Him (Alone), and be grateful to Him. To Him (Alone) you will be brought back. He (Exalted be He) further says inSurah Al Safat: And, verily, among those who followed his [Nûh's (Noah)] way (Islâmic Monotheism) was Ibrâhîm (Abraham).
When he came to his Lord with a pure heart [attached to Allâh Alone and none else, worshipping none but Allâh Alone true Islâmic Monotheism, pure from the filth of polytheism].
When he said to his father and to his people: "What is it that which you worship? "Is it a falsehood âlihah (gods) other than Allâh that you desire? "Then what think you about the Lord of the 'Alamîn (mankind, jinn, and all that exists)?" He (may He be Praised) also saysin Surah Maryam,concerning His Khalil Ibrahim (peace be upon him): And mention in the Book (the Qur'ân) Ibrâhîm (Abraham). Verily he was a man of truth, a Prophet.
When he said to his father: "O my father! Why do you worship that which hears not, sees not and cannot avail you in anything? "O my father! Verily there has come to me of the knowledge that which came not unto you. So follow me, I will guide you to the Straight Path.
"O my father! Worship not Shaitân (Satan). Verily Shaitân (Satan) has been a rebel against the Most Gracious (Allâh). "O my father! Verily I fear lest a torment from the Most Gracious (Allâh) should overtake you, so that you become a companion of Shaitân (Satan) (in the Hellfire)." [Tafsir AlQurtubî]
He (the father) said: "Do you reject my gods, O Ibrâhîm (Abraham)? If you stop not (this), I will indeed stone you. So get away from me safely (before I punish you)."