This is an important topics because it teaches us the significance of Tawheed in Islam. If you do not know your creator, how can you worship him? Therefore   The Sufis for instance, claim that Allah is everywhere, he may not be physically present everywhere but his reflection is shown in everyhting around us.

Evidences from the Qur’an

Quran is a book that provides us proof of everything.  The several verses are a proof existence of Allah, Allah says,  :

“And when Allah said: ‘O Jesus! I will take you and raise you to Myself’.”[3:55]

“To Him ascend (all) the goodly words, and the righteous deeds lift them.”[35:10]

“From Allah, the Lord of the Places of Ascent, the angels and the Ruh (Gabriel) ascend to Him in a day the measure whereof is of fifty thousand years.”[70:3-4]

 

“And He is the Subduer, above His slaves, and He is the All-Wise, Well Acquainted with all things.”[6:18]

And even more clearer:

“Do you feel secure that He, Who is fis-sama (above the heavens), will not cause the earth to sink…Or do you feel secure that He, Who is fis-sama (above the heavens) will not send against you a violent whirlwind?” [67:16-17]

“I will surely crucify you ‘fi’ (on) the trunks of palm-trees.”[20:71]

Evidences from the Sunnah 

The sunnah of the Prophet Muhammad peace be upon him provides explanation of the Quran. Here are some Hadiths whch are quoted for this matter:

Abu Hurairah narrates that the Messenger said, “Whoever donates the equal of a date from whatever was collected righteously, and only good is ascended to Allah, then, He will accept it (the charity) with His Right and raise it for its giver till it becomes like a mountain.” [Bukhari]

More clear:

Abdullah ibn Amr ibn Al-As related that the Messenger said, “Allah grants mercy to the merciful. Be merciful to those who are on the earth, (then) He Who is fis-Sama (above the heavens) will be merciful to you.” [Abu Dawood & At-Tirmidhi]

Even more clearer:

Jabir ibn Abdillah said: “The Messenger of Allah said in his speech on the day of Arafah: ‘Did I convey (the Message).’ They said: ‘Yes.’ While raising his finger to the sky and then pointing at them, he said: ‘O my Lord, be a witness.” [Muslim]

Muawiyah bin Al-Hakam As-Salmi said:

“I had a slave-girl who used to herd sheep for me. One day I discovered that a wolf had killed one of her sheep, and I’m a man from the children of Adam, I get upset like they get upset, and I slapped her in the face. Then I went to the Prophet who impressed upon me the seriousness of my act. I said, ‘O Messenger of Allah, should I not set her free?’ He said, ‘Bring her to me.’ He asked her, ‘Where is Allah’, She said, ‘He is above the heavens.’ He said, ‘Who am I?’ She said, ‘You are the Messenger of Allah.’ He said, ‘Free her, for she is a believer.’ (Muslim and Abu Dawud)

The belief that Allah is above the heaven indicates soundness of one’s belief, and it is mandatory on every believer to accept this. Allah is surely with us everywhere we go. Allah can be found in the heart of a Muslim because when someone calls his name, he listens and replies in his own way.

 

Source: missionislam.com/knowledge/whereallah.htm