Supplication is a type of worship, and through supplication, a person can establish a link and a connection with his Creator, which is a reason for his reconciliation of his desire and needs, whether worldly or eschatological, and since this connection with the Creator is the one who is able, is required by creatures who are in need and lack their need and poverty Absolute Rich. The best thing that a Muslim cared for in his life, made supplication an act of worship, kinship, and the most beneficial thing that the believer spent his time in, mentioned by his Lord, glory be to him, and his supplication accompanying him, for that is the best thing in which times are spent and the breaths spent in it, rather it is the greatest reason for the slave’ s happiness, comfort, and reassurance. His success in all its affairs, and it is the key to all the good that the servant attains in this world and the hereafter, as this study made in the sources of the Sunnis; in the investigations it includes: Supplication in language and idiom and its meanings-the merit of supplication-its legitimacy and the etiquette of supplication-the contraindications to the. supplication-times are legitimate Supplication-Benefits of supplication Methodology of investigation: After studying the books of supplication that were found in the library, then I graduated the verses, and listed the hadiths and the reported narrations, after that I came out what was mentioned in the books of interpretation. And I should point out that I mentioned the virtues and. conditions. . . . etc., in it I consulted the original sources and books on this topic Among the most important sources from which the demands were extracted: Interpretations, hadiths, and books on this topic, including: “ Among the wonders of supplication (stories of people who prayed to God, and they were answered by the advanced and contemporary), by Khaled bin Suleiman bin Ali al-Rabi'i, and the book“ Adah the preacher and the success of al-Sa’ i ” Ahmad bin Shams al-Din. Al-Asadi Al-Hilli, and “ Conditions for supplication and impediments to an-” swering in light of the Qur’ an and Sunnah“ Saeed Bin Ali Bin Wahaf Al-Qahtani.