DISBELIEVERS TAMPER WITH INTERCALATION
the Holy Qur'an

Verily the transposing (of a prohibited month) is an addition to Unbelief: the Unbelievers are led to wrong thereby: for they make it lawful one year, and forbidden another year, in order to adjust the number of months forbidden by God and make such forbidden ones lawful. The evil of their course seems pleasing to them. But God guideth not those who reject Faith. (9:37)

End of Quotes