Quran 2:195 — The Heifer (Al-Baqarah)

You shall spend in the cause of GOD; do not throw yourselves with your own hands into destruction. You shall be charitable; GOD loves the charitable.

[2:194] During the Sacred Months, aggression may be met by an equivalent response. If they attack you, you may retaliate by inflicting an equitable retribution. You shall observe GOD and know that GOD is with the righteous.

[2:196] You shall observe the complete rites of Hajj and'Umrah for GOD. If you are prevented, you shall send an offering, and do not resume cutting your hair until your offering has reached its destination. If you are ill, or suffering a head injury (and you must cut your hair), you shall expiate by fasting, or giving to charity, or some other form of worship. During the normal Hajj, if you break the state of Ihraam (sanctity) between 'Umrah and Hajj, you shall expiate by offering an animal sacrifice. If you cannot afford it, you shall fast three days during Hajj and seven when you return home—this completes ten—provided you do not live at the Sacred Masjid. You shall observe GOD, and know that GOD is strict in enforcing retribution.