What are the verses and hadiths on the obligation of unity and of holding to the community?

The Qur'anic verses and Hadiths that enjoin unity and community are numerous. Among them is Allah's saying: ﴿And hold firmly to the rope of Allah all together and do not become divided.﴾ [Quran 3:103], and His saying: ﴿And do not be like those who became divided and differed after the clear proofs had come to them. And for them is a great punishment.﴾ [Quran 3:105], and His saying: ﴿Indeed, those who have divided their religion and become sects – you are not [associated] with them in anything.﴾ [Quran 6:159], and His saying: ﴿And do not be of those who associate others with Allah those who divided their religion and became sects, each faction rejoicing in what it has.﴾ [Quran 30:31-32].

Among the Hadiths is the Prophet's saying (peace be upon him): "The similitude of the believers in their mutual love, mercy, and compassion is like that of a single body; if one of its limbs aches, the whole body responds to it with sleeplessness and fever." And his saying: "A believer to another believer is like a structure, parts of which support one another." And his saying: "Indeed, what destroyed those before you was their questioning and their differing with their prophets."