Sheikh `Abd al-Rahmân al-Barrâk
Remembrance of Allah is permitted at all times. We remember Allah by glorifying him (subhân Allah), by praising Him (al-hamdu Lillâh), by saying that there is no God but Allah (lâ ilâha illâ Allah) and by magnifying Him (Allahu akbar).
We also say “There is no might and no power except with Allah” (lâ hawla wa lâ quwwata illâ billâh).
Saying “subhân Allah wa bi-hamdihi” 100 times a day earns forgiveness for a person’s sins, though they be as plentiful as the foam of the sea.
The Prophet (peace be upon him) said: “There are two phrases that are light on the tongue but heavy in the balance. They are: ‘subhân Allah wa bi-hamdihi, subhân Allah al-azîm’.”
If a person says this often during the beginning, middle, and end of the day without counting how many times he recites it, this is good. This is general remembrance.
There are also remembrances that are prescribed for specific times during the morning and night and after prayers.
After every obligatory prayer, we should say “subhân Allah” “al-hamdu Lillâh” and “Allahu akbar” 33 times each.
The longest remembrance that is prescribed for us in the Sunnah is to say 100 times: “Lâ ilâha illa Allah wahdahu lâ sharîka lah. Lahu al-mulk wa lahu al-hamd wa huwa `alâ kulli shay’in qadîr”. (There is no God but Allah alone, without partner. His is the dominion and His is the praise. And He over all things has power."
The Prophet (peace be upon him) said: “Whoever says ‘Lâ ilâha illa Allah wahdahu lâ sharîka lah. Lahu al-mulk wa lahu al-hamd wa huwa `alâ kulli shay’in qadîr’ 100 times, it is as if he has freed 10 slaves and 100 good deeds will be written to his credit and ten evil deeds will be expunged. He will have protection from Satan throughout the day. No one can come with anything better except someone who recites it even more than that.” [Sahîh al-Bukhârî and Sahîh Muslim]
Source: Islam Today