kimhi is known primarily for his biblical commentaries on the books of the prophets. he also wrote commentaries on the books of genesis, psalms, and chronicles. his biblical work mirrors his grammarian work, and focuses on issues of language and form as well as upon content. he explains words on the basis of their grammatical construction and their etymological development. his commentary also includes homiletic and philosophical material, "niqqud" (vocalization), rabbinic tradition of the reading, and literal meaning of the words. he also addresses key issues such as the authorship of the various books and the historical eras in which the prophets were active, as well as other historical and geographical questions.