Shaikh Saaleh Al-Fawzaan [may Allaah preserve him] says:
“The people of knowledge [i.e. the scholars] are of the view that it is obligated on the Muslims in every era that if they are certain about the presence of this filthy doctrine [i.e. the doctrine of the khawaarij], they should remedy it through calling to Allaah [i.e. the correct way] and enlighten the people about that. If they [i.e. khawaarij] do not obey [and come out fighting], then they are fought [by the Muslim ruler] in order to repel their harm.”
[لمحة عن الفرق الضالة page 42]
Chapter: The Statement of the Prophet: [Whoever is able to marry, should marry, for that will help him lower his gaze and guard his modesty (i.e. his private parts from committing illegal sexual intercourse etc.).’ And should a person marry (even if) he has no desire for marriage?] [Kitaabun Nikaah’ Saheeh Al-Bukhaari’ Hadeeth Number 5065]
“While I was with Abdullaah, uthman met him at Mina and said, ‘O Abu Abdur-Rahmaan! I have something to say to you.’ So both of them went aside and uthmaan said, ‘O Abu Abdur-Rahmaan! Shall we marry you to a virgin who will make you remember your past days? When Abdullaah felt that he was not in need of that, he beckoned me (to join him) saying, ‘O Alqamah’ Then I heard him saying (in reply to uthmaan), ‘As you have said that, (I tell you that) the Prophet (sallal-laahu-alayhi-wasallam) once said to us, ‘O young people! Whoever among you is able to marry, should marry, and whoever is not able to marry, is recommended to observe fast as fasting will diminish his sexual power’.
Imaam Abdul Azeez Bin Baaz [rahimahullaah] explains:
“Therefore, getting married is the correct [thing to do] as an obligation upon the one who has shahwa [sexual desires] even if he is not in fear of falling to Zinaa, and this is with regards to the one whose situation allows him to get married. This [also shows] Uthman’s righteous moral conduct and that the elderly person can get married as long as he has the strength for sexual relations; and those mainly intended in this hadeeth are the young people, because in most cases they possess greater desires and are more in need of that.”
[Source: Al-Hulalul Ibreeziyyah Min At-Taleeqaat Al-baaziyyah Alaa Saheeh Al-Bukhaaree Volume 4; Hadith No:5065; Footnote Number 2]
Abdul Hameed Bin Abdillaah Ibn Muslim Ibn Yasaar [rahimahullaah] said:
“When Ibn Seereen [rahimahullaah] was imprisoned, the prisoners said to him, ‘’Go to your family at night and return in the morning”. So he said: By Allaah! I will not deceive the ruler.””
[Taareekh Baghdaad: [6/334]
Among The Virtues of The Prophet’s City- By Imaam Muhammad Ibn Saaleh Al-Uthaymeen (Rahimahullah)
Imaam Muhammad Bin Saaleh al-Uthaymeen (rahimahullaah) was asked about the statement of the Messenger (sallal-laahua-alayhi-wasallam) that: ‘’Verily Imaan returns and goes back to Madeenah as a snake returns and goes back to its hole.’’
In this hadeeth the Messenger (sallal-laahu-alayhi-wasallam) said: ‘’ Verily Imaan returns and goes back to Madeenah as a snake returns and goes back to its hole.’’ The word (يَأرِزُ)-Yarizo with a kasrah on the letter Raa can also have a Fatha or a Dammah (on the Raa). And the meaning of (يَأرِزُ) – Yarizo is that (Islaam) will return and it will be established in Madeenah, just as a snake returns to its hole after exiting it. This is an indication from the Prophet (sallal-laahu-alahi-wasallam) that this religion will return to Madeenah after the other lands become corrupted, just as a snake goes out and roams about in the earth, and then returns to its hole after that.
In this hadeeth is also an indication that just as Islaam did spread from Madeenah, it will also return to it; for indeed Islaam’s strength and authority did not spread except from Madeenah, even though its origin was in Makkah. Makkah was the first place where the revelation came down, but the Muslims were not able to establish a state, authority and Jihaad except after migrating to Madeenah. So for this reason, Islaam’s authority, enforcement and strength spread from Madeenah, and it will return to it in the end of time.
And some of the people of knowledge say that this (hadeeth) is indicative of an affair that has preceded, and that people did come to Madeenah and return to it in order to acquire the knowledge of the Sharee-ah and to study Islaam. However, the first meaning is what is apparent from the hadeeth. 
Saheeh Bukhaari: Summarized Version: Hadeeth Number: 909
[Source:Fataawaa Fadeelatus Shaikh Al-Allaamah Muhammad Bin Saaleh Al-Uthaymeen Fil Aqeedah: Vol:1-2: page: 84-85]
Among The Means To Tasting The Sweetness of Imaan
Abbaas Bin Abdul Muttalib [radiyallaahu-anhu] said that he heard Allaah’s Messenger [sallal-laahu-alayhi-wasallam] saying:
ذَاقَ طَعْمَ الإيمَانِ مَنْ رَضِيَ بِالله رَبّا وَ باْلإِسْلاَمِ دِيناً و بِمُحَمّدٍ رسولا
“The one who pleased that Allah is his lord and Islam is his religion and Muhammad is his messenger shall taste the sweetness of Imaan.”
The meaning of the Hadeeth is that he [or she] only seeks the [pleasure of] Allaah-The Most High .
He [or she] does not follow other than the path of Islaam and does not follow except that which is in agreement with Muhammad’s [sallal-laahu-alayhi-wasallam] Sharee’ah. 
There is no doubt that the sweetness of Eemaan becomes pure in the heart of one with these qualities and indeed he [or she] has [definitely] tasted its sweetness.
[Refs 1& 3: Source: Imdaadul Muslim Bi-Sharh Mukhtasar Al-Mundhiri Li-Saheehi Muslim. Vol 1. Page: 170 By Shaikh Ubaid Al-Jaabiri (may Allaah preserve him) – Slightly paraphrased]
[Ref 2: For more benefits from this hadeeth, see [مدارج السالكين- 2/171. By Imaam Ibnul Qayyim (rahimahullaah)]
Rabee Bin Khuthaym [rahimahullaah] used to say:
There is no good in speech except in nine[affairs]: Tahleel [i.e. uttering Laa-ilaaha ilal-laah]; Takbeer [i.e. uttering Allaahu Akbar]; Tasbeeh [i.e. uttering Subhaanallaah]; Tahmeed [i.e. uttering Al-Hamdulil-laah]; Enquiring about good; Seeking refuge from evil; Enjoining good; Forbidding evil and Recitation of the Qur’aan’’.
[Source: ‘Kitaab As-Samt’ by Ibn Abee Dunyaa (rahimahullaah) page:246]
Imaam Ibnul Qayyim [rahimahullaah] said: “
I used to hear Shaikhul Islaam Ibn Taymiyyah [rahimahullaah)] often saying:
[إِيَّاكَ نَعْبُدُ] – “You alone we worship” repels Riyaa
[ وَإِيَّاكَ نَسْتَعِينُ] – “And you alone we ask for help” repels Pride.”
Source: Badaa’i At-Tafseer’ 1/41-53
Ibn Mas’ood [radiyallaahu-anhu] said:
“Allaah gives the Dunyah both to the one He loves and the one He does not love, but He gives Eemaan only to the one He loves.”
[Musannaf Ibn Abee Shaybah’ 7/105]
Imaam Ibnul Qayyim [rahimahullaah] said:
“Whoever loves something will mention it a lot with his heart and tongue. And for this reason Allaah commanded His slaves to remember Him in all circumstances.”
[Uddatus Saabireen: 197