Prayer in Qur an and Old Testament

In history the most beautiful and melodious life’s moments for a pious human is praying with the Almighty God. Relying on the highest power in the cosmos and considering to source of World and independence from all creatures leads Man to mental peace. Could say the important common element among pious people in different eras was prayer, as the dialogue language of all pious people in different religions is prayer so they from this way pray with God and request their needs from Him. This article with referring to Holy Books and reliable Hadiths is studies the importance of prayer, the role of prayer in life of pious people, sincerity in prayer, the element of time and place, personal and social prayers, other key subjects, common titles and differences of two divine and benedictional religions of Islam and Jew from Qur’an and Old Testament point of view.