the Messenger of Allah (saas) said: "Indeed the supplication is the worship." Then he recited: "And your Lord said: Invoke Me, I will respond to you."
قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ الدُّعَاءَ هُوَ الْعِبَادَةُ ثُمَّ قَرَأَ {وَقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ}