Sunan Ibn Majah Book 34, Hadith 2

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."

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

Sunan Ibn Majah Book 34, Hadith 1
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the Prophet (saas) said: "There is nothing more noble to Allah the Glorified, than supplication."

Sunan Ibn Majah Book 34, Hadith 3