Abu Darda 
narrated that Rasool Allah 
said, “Should I not tell you of such a thinga which are the best and purest deeds in the court of your Lord, high in ranks (darajat), better for you then spending gold and silver (in Allah’s path), and better than slaying the neck of the enemy during war? The Sahaba said, “Yes, Oh Rasool Allah! .” He said, “It is Zikr of Allah.” (Tirmizi)
Abu Huraira narrated that Rasool Allah said, “Any gathering in which people sit and do not do Zikr of Allah and do not send Durood upon their Prophet is of loss for them. If Allah wills, give them azab (punishment) and if wills, forgive them.” (Tirmizi)
Abu Huraira narrated that Rasool Allah said, “Allah Tabaraka wa Ta’ala says when a person moves his lips for Zikr of Allah, I am with him. “ (Bukhari)
Abu Huraira narrated that Rasool Allah said, “Allah Tabaraka wa Ta’ala says I am closer to my slave than his supposition of which he keeps of me. And when he/her does Zikr of Allah, I am with him/her. If he does Zikr in his heart, I do his Zikr near MY proximity (closeness) and if he does Zikr in a gathering, I mention him in a gathering Afdhal (better) than it. (Bukhari)
Abu Musa Ash'ari narrated that Rasool Allah said, “He/She who does Zikr of Allah and he/she who doesn’t, their example is of like an alive and a dead. (Bukhari)
Abu Huraira said that Rasool Allah said, “The angels look for those who do Zikr of Allah on the paths. When they find those who are doing Zikr of Allah then they call each other, “Come, your desired has been found.” Then those angels cover those are doing Zikr of Allah up to the skies of this world with their wings. And Allah Rabbul Izzat says about them to those angels “What are my slave doing?” Though Allah knows more than those angels. The angels say, “Those people are doing your Tasbeeh, Tahmeed, and Tamjeed.” Rab Ta’ala says, “Have they seen me?” The angels say, “We swear by your pure Entity, they have not seen you.” Rab Ta’ala says to them, “If they had seen me then what would be their state?” The angels say, “If they could’ve seen you then they would do your Tamjeed and your Tasbeeh even more."
Rab Ta’ala says, “What slaves are asking from me?” The angels say, “They are asking for Jannat from you.” Rab Ta’ala says, “Have they seen Jannat?” The angels say, “We swear by Your Pure Entity, they have not seen Jannat.” Rab Ta’ala says, “If they had seen Jannat then what would be their state?” The angels say, “If these people had seen jannat then their greed, desire, and inclination for it would increase. Rab Ta’ala says, “What else are they doing?” The angels say, “They are seeking refuge.” Rab Ta’ala says, “From what are they seeking refuge?” The angels say, “They are seeking refuge from Hell.” Rab Ta’ala says, “Have they seen Hell?” The angels say, “Oh Rab, we swear by Your Pure Entity, they have not seen it.” Rab Ta’ala, “If they had seen it then what would be their state?” The angels say, “If they had seen it then they would run even further away from it and fear it even more.
Rab Ta’ala says, “angels, Be witnesses that I have forgiven them.” An angel says, “There is one person amongst them who is not part of those who do Zikr, he is there for some necessity of his/her.” Rab Ta’ala says, “These are such people that even those sitting among them are not deprived.” (Bukhari)
Anas narrated that Rasool Allah said, “When you pass by gardens of paradise, eat fruits of them. The Sahaba said, “What are the gardens of Paradise?” He said, “The gatherings of Zikr.” (Tirmizi)
Abu Huraira narrated Abu Saeed Khudri said that Rasool Allah said, “Whenever a Jama'at (a group of people) sits for Zikr of Allah, the angels surround it. Blessing covers that Jama'at. And peace and calm descends on them. And Allah mentions them to the angels present in HIS court. (Muslim)
Ameer Muaviah narrated that the Rasool Allah passed by a Jama'at and asked them, “Why have you gathered here?” Some people of the Jammat replied, “We have gathered here for the Zikr and Hamd of Allah because by guiding us towards Islam He did favor on us. Rasool Allah said, “By Allah, have you gathered only for this (purpose)?” They said, “By Allah, we have gathered here only for such purpose. Rasool Allah said, “I did not give you oath because of any imputation (doubt) rather it is because Jibraeel came to me and told me that Allah Azzawajal boasts of you in the gathering of the angels. (Muslim)
Abdullah Bin Abbas narrated that Rasool Allah said, “The Shaitan sticks to the heart of the child of Adam. When he does Zikr of Allah, he (the Shaitan) runs away from him. And when the child of Adam becomes careless from the Zikr of Allah, the Shaitan begins to put was-wasah (evil suggestions) into his heart. (Bukhari)
Abdullah Bin Umar narrated that Rasool Allah said, “Don’t have a conversation [without] Zikr of Allah. Because talking too much without Zikr of Allah is the reason for the heart’s hardness and wretchedness. And that person becomes distant from Allah in whose heart there is wretchedness. (Tirmizi)
Abudullah Bin Bisr narrated that one person asked, “Ya Rasool Allah! There are many commands on me of Islam. Tell me of such a thing which I may hold on to steadfast. Rasool Allah replied, “Always keep your tongue wet from Zikr of Allah.” (Tirmizi)
Abdullah Bin Bisr narrated that a villager came to the Holy Court of Rasool Allah and asked, “Which man is the best?” Rasool Allah said, “It is the luck and good-fortune of that person whose life is long and his deeds are good.” He asked, “Ya Rasool Allah! Which deed is the best?” Rasool Allah said, “Your tongue be wet from Zikr of Allah when you part from this world. (Tirmizi)
Muaaz bin Jabal narrated that Rasool Allah said, “The people of Jannat will only regret that moment which had been empty of Zikr of Allah.” (Beheqi)