وَقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ ۚ إِنَّ الَّذِينَ يَسْتَكْبِرُونَ عَنْ عِبَادَتِي سَيَدْخُلُونَ جَهَنَّمَ دَاخِرِينَ

This verse contains Allah's direct promise to answer prayers, making dua (supplication) both a form of worship and a guaranteed means of divine response. The Arabic word "astajib" indicates that Allah will definitely respond, though the response may come in different forms - granting the request, giving something better, or removing a harm. The verse then warns that those who are too proud to worship Allah (including making dua) will face humiliation in Hell. This teaches that dua is a form of worship that demonstrates humility and dependence on Allah, that Allah has promised to respond to sincere supplications, that pride prevents people from seeking Allah's help, and that refusing to worship Allah leads to ultimate humiliation. The verse encourages believers to make dua regularly and with confidence, knowing that Allah hears and responds to sincere prayers.