And hold fast, all together, by the rope of Allah and be not divided; and remember the favour of Allah which He bestowed upon you when you were enemies and He united your hearts in love, so that by His grace you became as brothers; and you were on the brink of a pit of fire and He saved you from it. Thus does Allah explain to you His commandments that you may be guided.
Islam, The Holy Qur’an, 3:104
Abu Musara reported the Prophetsa as saying, ‘Believers are to one another like a building whose parts support one another.’ He then interlaced his fingers.
Islam, The Holy Prophetsa, Hadith of Bukhari and Muslim
Consider, therefore, how Islam has, by offering this explanation of the expression Rabbul ‘Alamin, which is common to the followers of all religions, discovered to the world a new truth, and laid the foundations of the common brotherhood of man. Thereafter a Muslim can have nothing but reverence for the founders and leaders of other religions. For him, Krishnaas, Ramchandraas, Buddhaas, Zoroasteras and Confuciusas are as much the prophets of God as Mosesas and Jesusas, the only difference being that as the latter are mentioned in the Holy Qur’an, there is a greater amount of certainty concerning them.
Islam, the Promised Messiahas, Ahmadiyyat or the True Islam, p. 47
Behold, how good and pleasant it is
when brothers dwell in unity!
It is like the precious oil upon the head,
running down upon the beard,
upon the beard of Aaron,
running down on the collar of his robes!
Christianity, The Bible, Psalm 133
Happy is the unity of the Sangha.
Happy is the discipline of the united ones.
Buddhism, Dhammapada, 194
Israel’s reconciliation with God can be achieved only when they are all one brotherhood.
Judaism, Talmud, Menahot, 27a
Let all mankind be thy sect.
Sikhism,Adi Granth, Japuji 28, M.1, p. 6