Did you find the rules of Tajwid in the Arabic language before and after Islam?

There are well-known Tajweed rules among the Arabs before and after Islam, including both types of Idgham (assimilation), Qalqalah (echoing), Tarqeeq (lightening), and Tafkheem (heavying). These rules were mentioned by grammarians like Sibawayh, who transmitted them orally from the Arabs when the Arabic language was pure, before it mixed with other languages.