Allah will Harm You if you harm others

"If anyone harms (others), Allah will harm him, and if anyone shows hostility to others, Allah will show hostility to him."
(Sunan Abu Dawud)

"Those who have mercy will receive the mercy of the Most Merciful. Have mercy on those who are on earth, the One in heavens will have mercy on you." (Tirmidhi)

"The Muslim is one from whose tongue and hand other Muslims are safe." (Bukhari)

"Every Muslim is a brother to a Muslim, neither wronging him nor allowing him to be wronged. And if anyone helps his brother in need, Allah will help him in his own need; and if anyone removes a calamity from [another] Muslim, Allah will remove from him some of the calamities of the Day of Resurrection; and if anyone shields [another] Muslim from disgrace, Allah will shield him from the disgrace on the Day of Resurrection." [Al-Bukhari]