It was narrated from Nu'man bin Bashir that :the Messenger of Allah (PBUH) said: "Indeed the supplication is the worship." Then he recited: "And your Lord said: Invoke Me, I will respond to you.“
Hadees: Ibn Majah 3828

Your Lord has proclaimed, 
“Call upon Me, I will respond to you. 
Surely those who are too proud to worship Me will enter Hell, fully humbled.” Quran 40:60
Ghafir (Arabic: غافر, ghāfir; meaning: “The All-Forgiving”, referring to God), also known as Al-Muʼmin (Arabic: المؤمن, ’al-mu’min; meaning: The Believer), is the 40th chapter (sūrah) of the Qur’an, with 85 verses (āyāt).
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حَدَّثَنَا، عَنِ النُّعْمَانِ بْنِ بَشِيرٍ، قَالَ

قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم
‏"‏ إِنَّ الدُّعَاءَ هُوَ الْعِبَادَةُ ‏"‏

ثُمَّ قَرَأَ 
‏{وَقَالَ رَبُّكُمُ 
ادْعُونِي أسْتَجِبْ لَكُمْ}‏ 

وَقَالَ رَبُّكُمُ 
ٱدۡعُونِیۤ أَسۡتَجِبۡ لَكُمۡۚ 
إِنَّ ٱلَّذِینَ یَسۡتَكۡبِرُونَ عَنۡ عِبَادَتِی 
سَیَدۡخُلُونَ جَهَنَّمَ دَاخِرِینَ
There are seven Surahs (al-Mu’min, HaMim al-Sajdah, al-Shura, al-Zukhruf, al-Dukhan, al-Jathiyah, al-Ahqaf) that begin with the word “HaMim”. Thus these seven Surahs are also called “al-Hawamim”. These are Surahs of Da’wah, inviting people to believe in Allah, take advantage of the mercy of Allah. There is solace and comfort in these Surahs for the Believers who were persecuted because of their faith and they are given the good news that the truth will prevail.
´نعمان بن بشیر رضی اللہ عنہما کہتے ہیں کہ`

رسول اللہ صلی اللہ علیہ وسلم نے فرمایا: 

”بیشک دعا ہی عبادت ہے،

پھر آپ صلی اللہ علیہ وسلم نے یہ آیت تلاوت فرمائی:
”اور تمہارے رب نے کہا: 
دعا کرو (مجھے پکارو) 
میں تمہاری دعا قبول کروں گا (سورة الغافر: 60)“۔

تمہارا رب کہتا ہے
 "مجھے پکارو، میں تمہاری دعائیں قبول کروں گا، 
جو لوگ گھمنڈ میں آ کر میری عبادت سے منہ موڑتے ہیں، ضرور وہ ذلیل و خوار ہو کر جہنم میں داخل ہوں گے"
The Qur’an is from Allah who is both Merciful and Severe in Punishment. Warnings to the non-believers and comfort to the believers.
The failure of the disbelievers. The Day of Judgment belongs to Allah.
A lesson from the history of Prophet Moses -peace be upon him. Even the mighty Pharaoh and his army could not help him against the wrath of Allah.
A Believer from the Pharaoh’s people declared his faith. His conversation with his people.
The false leaders will take their people to hell.
Allah helps the Prophets and their followers.
The Glory of Allah. Allah has power over life and death.
The fate of the un-believers will be bad.
Take lessons from the past history. After the judgment comes, repentance makes no difference.