Abstract
The Arabic language is the language of the Holy Quran, whose wonders do not expire; therefore, the second greatest inscription after the holy Quran is Prophet Muhammad’s (peace be upon him) Sunnah. No doubt that the Prophet's Hadith is the second source of legislation for Muslims after the Holy Quran, and prophet Muhammad (peace be upon him) confirmed its importance when he said, in a long conversation: (... surely I have been given the Quran and others similar to it...)). Hence, muslim scholars have taken special care of Hadith, and they were preoccupied with explanation and interpretation of its secrets and studied its science, arts, language, rules and others. Of those who studied the Prophet’s Hadith was Abu Al Hassan Obeid Allah Al Rahmani Mabarkfouri (died in 1414 AH). The paper is thus entitled " Grammatical Lesson about “ Kana Wa Akhawatiha” “Kaana Group” in (Muraat Al Masabeeh Sarh Mishkat Al Masabeeh) by Obeid Allah Mabarkfouri. The study is divided into an introduction and two chapters about (kaana) and its group and a conclusion summarizing the most important findings.