This paper explores the foundations of quantifying the Arabic language laid by Al-Khalil ibn Ahmad Al- Farahidi (d. 175 AH) through his seminal works on the dictionary Al-Ayn and establishing the science of Arabic prosody. Using an inductive, comparative methodology, the paper analyzes Al-Farahidi's techniques to uncover his principles of quantification focused on achieving stability, objectivity, generalization, analogy, and accurate measurability. Al-Farahidi pioneered the systematic classification of Arabic lexicon based on the number of root letters and mathematical permutations. His dictionary covered all possible Arabic words systematically derived from two to five root letters. He also devised a formal prosodic system rooted in the basic units of vowel motion and stillness to quantify Arabic poetry. Al-Farahidi set clear objectives, defined the subjects of quantification, categorized lexical and prosodic types, formed quantitative relational equations, and highlighted exceptions. He also employed logic, objectivity, and experiential evidence. The principles extracted from Al-Farahidi's quantitative methods can enrich Arabic language studies today and align them with modern scientific techniques. Investing in Al-Farahidi's methodology can enable progress in linguistics through computational techniques. The paper concludes that Al-Farahidi's founding techniques contain the blueprint for quantifying the qualitative dimensions of the Arabic language and transforming linguistic research.