London Brotherhood Lecture June 2010 (telelink)
Brotherhood / Sisterhood in Islam
Mustafa George (hafidhahullaah)
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Shaykh Ibn al-‘Uthaymeen – hafidhahullaah – said:
“From the sincere advice which I hold to be necessary in the Religion to give to the youths, a word which I hope that Allaah – the Most Perfect, the Most High – will cause to be of benefit, and it is:That they should all be in conformity and harmony, so that they may become strong, and become an obstacle blocking the way of those who plot against Islaam and its people. This is what Allaah – the Mighty and Majestic – has enjoined upon us. He – the Most High – said: “And hold fast altogether to the rope of Allaah and do not be divided. And remember the favour of Allaah upon you, in that you were once enemies to one another, but He joined your hearts together, so that by His Grace you became brothers.” [Soorah Aal-‘lmraan 3:103]. And Allaah the Blessed, the Most High – said: “Let there arise from amongst you a group of people inviting to all that is good, enjoining the good and forbidding the evil. It is they who are the successful ones, And do not be like those who differed amongst themselves after the clear proofs had come to them; for them is a painful punishment.” [Soorah Aal-‘lmraan 3:104-105]. So Allaah ordered that they should all cling together to His rope and He forbade splitting, and in other Aayahs He forbade differing, and informed us that it is the cause of failure and the cause of decline of strength, and He ordered us to persevere patiently. So Allaah – the Most High – said: “And do not differ, lest you lose courage and your strength departs, and be patient. Indeed Allaah is with those who are patient.” [Soorah al-Anfaal 8:46]. And as is known, the people of good who help the youths of the revival in their work – with what they are able from wealth, and so on – if they see them splitting in this way, then they will not be so eager to help and assist them. So I call all of our brothers to unite together, and to fear Allaah with regards to themselves and with regards to the Ummah (nation) of Islaam, and that they should not cover up this light which has appeared on the horizon; the call to Allaah – the Mighty and Majestic …” 
Ibn Taymiyyah (d.728H) – rahimahullaah – said:
“Holding fast to the rope of Allaah altogether and not becoming divided is one of the greatest usool (fundamentals) of Islaam.” 
 From a series of questions and answers, recorded on the 16th of Dhul-Hijjah 1416H (corresponding to the 3rd of May 1996CE).
 Majmoo’ Fataawaa (22/359).