"Allah said: 'I have divided the prayer between Myself and My slave into two halves, and My slave shall have what he has asked for.'When the slave says: 'Al-hamdulillah i rabbil Alameen (All the praise is to Allah, the Lord of all that exists),' Allah says:'My slave has praised Me, and My slave shall have what he has asked for.' And when he says: 'Ar-Rahmanir-Rahim (The Mos Gracious, the Most Merciful),' Allah says: 'My slave has extolled Me, and My slave shall have what he has asked for.' And when he says: 'Maliki yawmiddin ,' He says: 'THis is for My slave, and My slave shall have what he has asked for."
Sunan Ibn Majah Book 33, Hadith 128