The Prophet ﷺ said regarding the verse "And your Lord said, call upon Me, I will respond to you" [Ghafir 40:60], "Supplication is worship." Then he recited, "And your Lord said, call upon Me, I will respond to you. Indeed, those who disdain My worship will enter Hell humiliated" [Ghafir 40:60].
حدثنا هناد حدثنا أبو معاوية عن الأعمش عن ذر عن يسيع الكندي
عن النبي ﷺ في قوله {وقال ربكم ادعوني أستجب لكم} قال الدعاء هو العبادة وقرأ {وقال ربكم ادعوني أستجب لكم} إلى قوله {داخرين}
Sourcing, sahih. Bukhari also narrated it in the tafsir chapter, section, "Eat and drink until the white thread becomes distinct from the black thread at Fajr," hadith no. 4510, and Muslim, hadith no. 1090, from the hadith of Shaybi through this same route. See the previous hadith.