Kitab al-‘Ayn (كتاب العين) is regarded as the first dictionary of the Arabic language, the current standard for Harakat (vowel marks in Arabic script), and the invention al-‘arud [the study of Arabic prosody (the patterns of rhythm and sound used in poetry)],musicology and metre. This book was written by the polymath Al-Khalil ibn Ahmad al-Farahidi who was born in 110 AH/718 CE. It is therefore obvious that efforts were made very early on to preserve the arabic language as spoken and understood during the time of the Prophet Muhammad ﷺ.
Compare this with the fact that the Jews only started paying attention to Hebrew grammer and lexicography in the 8th Century AD inspired by Muslims in Iraq, Egypt, North Africa and Spain. The first full scale Biblical language dictionary was compiled in the 10th century by David al-Fasi. (International Encyclopedia of Linguistics: AAVE-Esperanto. Vol. 1, History of Linguistics, Eastern Tradition, Jewish Tradition page 199)