Quran 2:186 from Surah Al-Baqara on Divine Marvels.
وَإِذَا سَأَلَكَ عِبَادِي عَنِّي فَإِنِّي قَرِيبٌۖ أُجِيبُ دَعۡوَةَ ٱلدَّاعِ إِذَا دَعَانِۖ فَلۡيَسۡتَجِيبُواْ لِي وَلۡيُؤۡمِنُواْ بِي لَعَلَّهُمۡ يَرۡشُدُونَ
English translation: And when ask you My servants about Me then indeed I am near I respond (to the) invocation (of) the supplicant when he calls Me So let them respond to Me and let them believe in Me so that they may (be) led aright
Transliteration: wa-idha sa-alaka ibadi anni fa-inni qaribun ujibu da'wata al-da'i idha da'ani falyastajibu li walyu'minu bi la'allahum yarshuduna