"The Muslim who does not pray must be ordered to pray; if he refuses to pray, he must be put to death, because he would be an infidel and apostate, according to the scholars and Imams, even if he said that Muhammad is the apostle of God, and even if he was convinced of the purposes of prayers" (ibn Taymiyya, law pertaining to the apostate, vol. 35, pp. 105-106).
"If a wife abstain from praying, she would be asked to repent. The husband may scourge her to repent, otherwise she must be killed." (ibn Taymiyya, vol. 32, pp. 276 and 279)