"Taqiyya (pronounced tak-e-ya) : precautionary dissimulation or deception and keeping one's convictions secret and a synonymous term, Kitman: mental reservation and dissimulation or concealment of malevolent intentions..."
"According to Christian ethics lying is a sin; In Islamic jurisprudence and theology, the use of taqiyya against the unbelievers is regarded as a virtue and a religious duty."
Thank you.
I couldn't remember the name of that concept.