Messenger of Allah (saas) said: "Whoever does not call upon Allah, He will be angry with him."  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ لَمْ يَدْعُ اللَّهَ سُبْحَانَهُ غَضِبَ عَلَيْهِ  

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}  

the Prophet (saas) said: "There is nothing more noble to Allah the Glorified, than supplication."  

عَنِ النَّبِيِّ ﷺ قَالَ لَيْسَ شَىْءٌ أَكْرَمَ عَلَى اللَّهِ سُبْحَانَهُ مِنَ الدُّعَاءِ