In our daily live, we search peace of mind and tranquility in every possible way. But every thing we search in may not bring us sustainable peace of mind and tranquility. There are people who are successful in getting truth and peace of mind in their live. How did they get? The simplest answer is knowing and believing in one Lord, That is Allah. One scholar said, “Inhabitants of this world left the world without tasting the best thing in it.” He was asked, “What is best thing?” He replied, “Knowing and loving Allah.” So Who is your Lord?
Say, “He is Allah , [who is] One, (Al-Qur’an, surah Al-Ikhlas 112:1
Keeping these verses in view, let us consider that when the people asked: Who is your Lord and what is He like to Whom service and worship you call us. The answer given was Huwa Allah: He is Allah. This answer by itself gives the meaning: My Lord is He whom you yourself acknowledge as your own as well as the whole world’s Creator, its Master, Sustainer and Administrator, and He whom you invoke for help at critical times beside all other deities, and I invite you to His service alone. This answer comprehends all the perfect and excellent attributes of Allah.
Then, keeping in view the questions that the polytheists and the followers of earlier scriptures asked the Prophet (peace be upon him) about his Lord, let us see how they were answered with ahad-un after Huwa-Allah.
First, it means: He alone is the Sustainer: no one else has any share or part in providence and since He alone can be the Ilah (Deity) Who is Master and Sustainer, therefore, no one else is His associate in Divinity either.
Secondly, it also means He alone is the Creator of the universe: no one else is His associate in this work of creation. He alone is the Master of the universe, the Disposer and Administrator of its system, the Sustainer of His creatures, Helper and Rescuer in times of hardship; no one else has any share or part whatever in the works of Godhead, which as you yourselves acknowledge, are works of Allah.
Thirdly, since they had also asked the questions: Of what is your Lord made? What is His ancestry? What is his sex? From whom has He inherited the world and who will inherit it after Him? All these questions have been answered with one word ahad for Allah. It means:
(1) He alone has been, and will be, God forever; neither was there a God before Him, nor will there be any after Him.
(2) There is no race of gods to which He may belong as a member: He is God, One and Single, and none is homogeneous with Him.
(3) His being is not merely One (wahid but ahad, in which there is no tinge of plurality in any way:
He is not a compound being, which may be analyzable or divisible, which may have a form and shape or may contain or include something, which may have a color, which may have some limbs, and which may be variable or changeable in any way. Free from every kind of plurality He alone is a Being who is Ahad in every aspect.
“Allah , the Eternal Refuge.
He neither begets nor is born,
Nor is there to Him any equivalent.” (Al-Qur’an, surah Al-Ikhlas 112:2-4
Source: quran.com Sayyid Abul Ala Maududi Translation