Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Beware of suspicion, for suspicion is false talk. Do not spy, do not pry, do not try to outdo one another, and do not envy, hate or cut off relations with one another; and, O servants of Allah, be brothers."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21059