It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: "The first to speak (eloquent) Arabic, to lay the foundation of writing (the script) upon its pronunciation and manner of speech, and then to write it as a single connected text, like 'Bismillah al-Rahman al-Rahim' with its letters joined, until later his descendants began to separate (write apart) its (words), was Isma'il bin Ibrahim (peace be upon them both)." The chain of this hadith is sahih (authentic), but the two Shaykhs did not record it.