It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed Allah, the Mighty and Majestic, says: My servant continues to draw near to Me through voluntary deeds until I love him. Then I become his hearing with which he hears, his sight with which he sees, his tongue with which he speaks, and his heart with which he understands. Then, when he calls upon Me, I answer him; when he asks of Me, I give him; and when he seeks My help, I help him. And the most beloved worship with which My servant worships Me is sincerity towards Me."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7802