God says
And do not allow your oaths in the name of God to keep yourselves from being virtuous and God-consciousness and from the performance of peace between fellow-men:* for God is all-hearing, all-knowing.-- Q.2:224
* As can be seen from verse 226, this injunction refers primarily for oaths relating to divorce but is, nevertheless, general in its import. Thus there are several authentic Traditions to the effect that the Prophet said: “If anyone takes a solemn oath [that he would do or refrain from doing such and such a thing], and thereupon realizes that something else would be a more righteous course, then let him do that which is more righteous, and let him break his oath and then atone for it” (Bukhari and Muslim; and other variants of the same Tradition in other compilations).
See verse 5 : 89 as regards the method of atonement.
O you who believe! Do not deprive your charitable deeds of all worth by stressing your own benevolence and hurting [the feelings of the needy], as does he who spends his wealth only to be seen and be praised by men, and believes not in God and the Last Day: Q.2:264
O people of the Scriptures! Do not exaggerate in your religion nor utter aught concerning God save the truth. Q.4: 171
Prophet said
1. “A mischief monger (causing discord) shall not enter paradise.”-- H: Bukhari and Muslim. N: Huzaifah.
2. “A Muslim is he from whose tongue and hands other Muslims* are safe”-- H: Bukhari and Muslim. N: Abdullah-b-Amr.
* “Muslims and also the non-Muslims”. This can be seen in the verses from the Qur’an, for instance 2:38: “…and speak kindly to mankind”.
As the environment in which Muslims stayed their interaction was generally with other Muslims, hence the reference to Muslims in the Tradition.
