1-Islam: Prayer is not valid if performed by an unbeliever. 2-Sanity: Prayer is not valid if performed by an insane person. 3-Puberty: It is not required of a child until he or she attains puberty. 4-Purification: From any discharge that invalidates ablution. 5-Appropriate time: Each prayer has its appointed time range and for a prayer to be valid. 6-Covering the awrah, which is the private parts and the area around them. 7-Avoiding all impurity on one’s body, clothes and the place where one is praying. 8-Facing the qiblah (i.e. the direction towards the Ka bah) when one is able to do so. 9-Intention: The intention is a mental process and need not be vocalized.