ALLAH, the Exalted, says in the glorious Quran:
"And the remembering (praising) of (you by) ALLAH (in front of the angels) is greater indeed [than your remembering (praising) of ALLAH in prayers]'' (29:45)
"Therefore remember Me (by praying, glorifying). I will remember you.'' (2:152)
"And remember your Rubb by your tongue and within yourself, humbly and with fear and without loudness in words, in the mornings and in the afternoons, and be not of those who are neglectful.'' (7:205)
"And remember ALLAH much, that you may be successful.'' (62:10)
"O you who believe! Remember ALLAH with much remembrance. And glorify His Praises morning and afternoon [the early morning (Fajr) and `Asr prayers].'' (33:41,42)
Some Hadiths:
1. Abu Hurairah (May ALLAH be pleased with him) reported: The Messenger of ALLAH (PBUH) said, "There are two statements that are light for the tongue to remember, heavy in the Scales and are dear to the Merciful: `Subhan-Allahi wa bihamdihi, Subhan-Allahil-Azim [Glory be to ALAH and His is the praise, (and) ALLAH, the Greatest is free from imperfection)'.'' [Al-Bukhari and Muslim].
2. Abu Hurairah (May ALLAH be pleased with him) reported: The Messenger of ALLAH (PBUH) said, "The uttering of the words: "Subhan-ALLAH (ALLAH is free from imperfection), Al-hamdu lillah (all praise is due to ALLAH), La ilaha illallah (there is no true god except ALLAH) and Allahu Akbar (ALLAH is the Greatest)' is dearer to me than anything over which the sun rises.'' [Muslim].
3. Abu Musa Al-Ash`ari (May ALLAH be pleased with him) reported: The Prophet (PBUH) said, "The similitude of one who remembers his Rubb and one who does not remember Him, is like that of the living and the dead.'' [Al-Bukhari and Muslim].
4. Mu`adh (May ALLAH be pleased with him) reported: The Messenger of ALLAH (PBUH) took hold of my hand and said, "O Mu`adh! By ALLAH I love you, so I advise you to never forget to recite after every prayer: "Allahumma a`inni ala dhikrika, wa shukrika, wa husni `ibadatika (O ALLAH, help me remember You, to be grateful to You, and to worship You in an excellent manner).'' [Abu Dawud].
5. `Aishah (May ALLAH be pleased with her) reported: The Messenger of ALLAH (PBUH) used to recite in his bowing and prostration: "Subbuhun Quddusun, Rabbul-mala'ikati war-ruh [You are the Most Glorious. The Most Holy. You the Rubb of the angels and of Jibril
[Muslim].
6. Ibn `Abbas (May ALLAH be pleased with them) reported: The Messenger of ALLAH (PBUH) said: "Glorify your Lord in Ruku` (bowing posture) and exert yourself in supplication in prostration. Thus your supplications are liable to be accepted.'' [Muslim].
7. Abu Hurairah (May ALLAH be pleased with him) reported: The Messenger of ALLAH (PBUH) said, "A slave becomes nearest to his Rubb when he is in prostration. So increase supplications while prostrating.'' [Muslim].
8. Sa`d bin Abu Waqqas (May ALLAH be pleased with him) reported: We were with the Messenger of ALLAH (PBUH) when he asked, "Is anyone of you unable to earn a thousand good deeds?'' One of those present asked: "How can one earn thousand good deeds in a day?'' He (PBUH) replied, "By saying: Subhan ALLAH a hundred times, then one thousand good deeds will be recorded for him or one thousand sins will be blotted out from his record.'' [Muslim].
9. Abu Hurairah (May ALLAH be pleased with him) reported: The Messenger of ALLAH (PBUH) said, "ALLAH the Exalted says: `I am as my slave expects me to be, and I am with him when he remembers Me. If he remembers Me inwardly, I will remember him inwardly, and if he remembers Me in an assembly, I will remember him in a better assembly (i.e., in the assembly of angels).'' [Al-Bukhari and Muslim].
10. Abu Hurairah (May ALLAH be pleased with him) reported: The Messenger of ALLAH (PBUH) said, "The Mufarridun have gone ahead.'' He was asked, "Who are the Mufarridun?'' He (PBUH) replied, "Those men and women who frequently celebrate the remembrance of ALLAH.'' [Muslim].
11. Jabir (May ALLAH be pleased with him) reported: I heard the Messenger of ALLAH (PBUH) saying, "The best way to celebrate the remembrance of ALLAH is to say: La ilaha illallah (there is no true god except ALLAH).'' [At-Tirmidhi].
12. `Abdullah bin Busr (May ALLAH be pleased with him) reported: One of the Companions said, "O Messenger of ALLAH. There are many injunctions of Islam for me. So tell me something to which I may hold fast.'' He said, "Keep your tongue wet with the remembrance of ALLAH.'' [At-Tirmidhi].