Hugely rewarding Dhikr to do each day:
1 Millions of Good deeds in seconds:
“Whoever enters a market and says:
‘Laa ilaha illallah wahdahu la shareeka lah, lahul mulku wa lahul hamdu yuhyi wa yumeetu wa huwa hayyun laa yamoot, bi yadihil khair, wa huwa ‘ala kulli shayin qadeer’
There is nothing worthy of worship except Allah, alone without partner, to Him belongs dominion and praise, He causes life and feath and He is the Living and does not die. In His Hand is all the good, and He is over all things competent
… Allah will write for him/her a million good deeds and erase a million bad deeds and raise him a million levels.” [Tirmidhi]
2 That Which Shall Have no Equal on the Day of Resurrection:
Abu Huraira (Ra) narrated that the Prophet (Sallallahu Alaihi Wasallam) said: ”Whoever says one hundred times in a day:
“La ilaha illal-lah wahdahu la sharika lahu, lahu-l-mulk wa lahu-l-hamd wa huwa ‘ala kulli shai’in qadir,”
None has the right to be worshipped but Allah, the Alone Who has no partners, to Him belongs Dominion and to Him belong all the Praises, and He has power over all things (i.e. Omnipotent)
he will get the same reward as given for manumitting ten slaves; and one hundred good deeds will be written in his accounts, and one hundred sins will be deducted from his accounts, and it (his saying) will be a shield for him from Satan on that day till night, and nobody will be able to do a better deed except the one who does more than he.” [Bukhari, Book #75, Hadith #412]
3 Huge rewards for reciting dhikr after prayer
Abu Hurayrah (Ra) narrated that a group of destitute people came to the Prophet (Sallallahu Alaihi Wasallam), and said, “O Messenger of Allah, the wealthy people will have higher grades and will have permanent enjoyment in high levels in Paradise. They pray like us and fast as we do, but they have more money by which they perform the Hajj, ‘Umrah, participate in Jihaad and give in charity.”
The Prophet (Sallallahu Alaihi Wasallam), replied: “Shall I not tell you something upon which if you acted you would catch up with those who have surpassed you? Nobody would surpass you and you would be better than the people amongst whom you live except those who would do the same.
Say: ‘Subhaan Allaah’, ‘Alhamdulillaah’ and ‘Allaahu Akbar’thirty-three times each after every (compulsory) prayer.’" [Al-Bukhari]
4 Guaranteed place in Paradise:
The Prophet (Sallallahu Alaihi Wasallam) said: "Whoever recites Aayatul Kursi after every Fard (Fard Salah). Only death is keeping him/her from entering Jannah. (As soon as he/she dies, will enter Jannah) [Nisa'i, Ibne Habban]
5 Reciting 3 heavy phrases:
Juwairiyah bint Al-Harith (Ra) reported: The Prophet (Sallallahu Alaihi Wasallam) came out from my apartment in the morning as I was busy in performing the dawn prayer. He came back in the forenoon and found me sitting there and said, “Are you still in the same position as I left you.” I replied in the affirmative. Thereupon the Prophet (Sallallahu Alaihi Wasallam) said, “I recited four phrases three times after I had left you. If these are to be weighed against all you have recited since morning, these will be heavier. These are:
Subhan-Allah wa bihamdihi, ‘adada khalqihi, wa rida-a nafsihi, wa zinatah ‘arshihi, wa midada kalimatihi
Allah is free from imperfection and I begin with His praise, as many times as the number of His creatures, in accordance with His Good Pleasure, equal to the ink that may be used in recording the words (for His Praise).” [Muslim]
6 The Virtues of reciting "Subhanallah":
The Prophet (Sallallahu Alaihi Wasallam) said: "Is anyone of you incapable of earning one thousand Hasanah (rewards) a day?" Someone from the gathering asked, "How can anyone of us earn a thousand Hasanah?"
Prophet (Sallallahu Alaihi Wasallam) said: "Glorify Allah a hundred times by just saying “Subhanallah” and a Good deeds will be written for you, or a thousand sins will be wiped away.” [Muslim 4:2073]
Another version says:
...a thousand good deeds are recorded for him and a thousand bad deeds are wiped away. [Muslim]
When you go to bed, glorify Him and praise Him and magnify Him One hundred times:
The Prophet (Sallallahu Alaihi Wasallam) said: "Who among you does 2,500 bad deeds in one day?’ They said: ‘How could we not count (our sins)?’ He said: ‘The Shaytaan comes to any one of you whilst he is praying and says, Remember this, remember that, until he finishes his prayer and does not do (this dhikr), or he comes to him when he is lying down and makes him sleepy, until he falls asleep (without doing this dhikr).’” (Sunan al-Tirmidhi, 3332).
7 A tree in Paradise for each word:
The Prophet (Sallallahu Alaihi Wasallam) said: “Whoever recites the folllowing words, a tree in Paradise is planted for him for each word he says.”
Subhāna-llāhi, wa-l-hamdu li-llāhi, Wa lā ilāha illā-llāhu, wa-llāhu akbar. Wa lā hawla Wa lā quwwata illā bi-llāhi-l-‘aliyyi-l-‘azīm
(Glory be to Allah. And praise be to Allah. And there is no god except Allah. And Allah is the Greatest. And there is no power and no strength except with Allah, the Most High, And Most Great) [Tirmidhi]
8 Forgiveness like foam of the Sea:
Abu Hurayrah (Ra) narrated that the Prophet (Sallallahu Alaihi Wasallam) said: ‘Whoever says: Subhanallah wa bi hamdih (Praise and glory be to Allah) 100 times, morning and evening, his sins will be erased even if they are like the foam on the sea.” [Bukhari]
9 Most pleased on the day of Judgement:
Allah has promised that anyone who says this three times every morning or evening will be pleased on the Day of Resurrection:
Radheetu billaahi Rabban, wa bil-’Islaami deenan, wa bi-Muhammadin (sallallaahu ‘alayhi wa sallama) Nabiyyan.
I am pleased with Allah as my Lord, with Islam as my religion and with Muhammad (Sallallahu Alaihi Wasallam) as my Prophet. [Fortress of the Muslim]
Another version says:
Jannah becomes obligatory for him (to enter). [Abu-Dawud]