Narrated An-Nu'man bin Bashir:
that the Prophet (ﷺ) said: "Supplication is the worship." Then he recited: 'And your Lord said: 'Call upon Me, I will answer you. Verily, those who scorn my My worship, they will surely enter Hell in humiliation (40:60).'" (PT)
English reference (PT): Vol. 5, Book 44, Hadith 3247 (PT)
Arabic reference (PT): Book 47, Hadith 3555 (PT)