There are many matters make man learn Tajweed, among them that comes to keep the tongue from the mistake in the articulations of the Holy Quran when recitation, it is also helps in : 1- Meditate the meanings of the Quran . 2 - contemplating its verses and its purposes. 3- It is also helps in learning ِArabic Language. 4 - Goodness of the performance. 5 - The reciter can keep his tongue from making mistakes during recitation to the verses of the Quran. 6- achieving happiness in the world and in the hereafter. 7 - Reaching the reciter of the Quran to recite it softly as revealed from Almighty Allah. 8- Quality of recitation . Secondly : Learning Tajweed(intonation) has many virtues and of them that come : 1- Following the example of Allah’s Messenger [PBUH] and the noble companions, for Almighty Allah has recited The Quran intonated(Mujawwad) to Gabriel [MPW]and Gabriel recited it intonated(Mujawwad) to the prophet [PBUH] , and the prophet [PBUH] recited it to the noble companions . 2- Achieving servitude to Almighty Allah and following His orders and in compliance to His saying : “and recite the Quran with measured recitation.” 3- Reaching to Almighty Allah's love ,through mastery of learning the Quran and intonating it (tajweed ahu) and knowing its rules. 4 - learning it considers one of the best and most honorable sciences, because it is related to the noblest Book, it is the Book of Almighty Allah. Thirdly : Rule of learning Tajweed(intonation) varies as follows : Knowledge of the intonation’s provisions and its parts considers a collective duty for common Muslims , meaning if a group of Muslims learnt it there will be no sin upon the others,either for the scholarists(Al -ulmaa)and the Quran’s keepers(Hafadhatul-Quran) learning intonation’s provisions and its parts considers individual duty, as for working with Tajweed and practicing it, it’s individual duty upon whoever recite the Quran to worship witn, whether for recitation in the prayer or outside. ًWe extract from the above that working in intonation (tajweed) is an individual duty upon every adult Muslim when recitation the Quran , reciting the Holy Quran and and recite it intonated (Mujawwad) is from the obligatory duties upon whoever wants to recite the Quranو, there are many proofs on that , as His saying The Almighty in His commending on the Quran’s keepers(Hafadhatu - al -Quran) :