Then when the Sacred Months ( the Ist , 7th , 11th , and 12th months of the Islamic calendar ) have passed , then kill the Mushrikun ( see V. 2 : 105 ) wherever you find them , and capture them and besiege them , and prepare for them each and every ambush . But if they repent and perform As-Salat ( Iqamat-as-Salat ) , and give Zakat , then leave their way free .