Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Allah, the Almighty, says: 'I am with My slave as long as he remembers Me and his lips move saying My Name.'"
This Hadīth indicates that whoever remembers Allah, Allah is close to him and is with him in all of his affairs. He grants him success, guides him, supports him, and answers his supplication. Another Hadīth with the same meaning was narrated by Al-Bukhāri: The Messenger of Allah (may Allah’s peace and blessings be upon him) said: "Allah, the Almighty, said: 'I am as my slave thinks of me, and I am with him as he remembers Me. If he remembers Me in himself, then I shall remember him in Myself, and If he remembers Me in a congregation, then I shall remember him in a better congregation.'"