It's one of the many "doctrines" muslims sell as part of the "soft Jihad". Al-Taqiyya is the "holy" act of LYING ABOUT THE RELIGION. It's in the Quran. Look it up :D
Printed copy · Anthology Volume 9, page 1249Printed copy from The Tender For Law Anthology, Volume 9, page 1249 (printed 13 June 2014). Added by this site; not part of the Facebook export.