פּירוש אויף בראשית 4:22

תובל קין TUBAL-CAIN — He refined Cain’s handicraft. The word תובל is connected in meaning with תבלין (spices which give a refined and improved taste to food); he refined and improved the work of Cain by providing weapons for murderers (Genesis Rabbah 23:3).

"And the sister of Tuval-Cain was Naamah." She was known in the days of Moshe our teacher and the Israelites, and thus it says (Genesis 36:22) "And the sister of Lotan was Timna," because she was famous. Know that all of these were wiped out and turned into demons, and were well-known, and it is not my desire to discuss this at length, therefore I am writing here.

וצלה גם היא ילדה, “and Tzilah, she too had given birth.” The reason why the Torah introduces this statement with the word גם “also,” is that Lemech had married her only for her physical attributes. She was not intended by him to bear children. All the birth control devices she used had proved ineffective. There are bodies that are immune to such devices (as ancient man used to delay or prevent pregnancy). [The reader can find more on the subject in the Talmud Niddah folio 30. Ed.] The reason why the Torah even mentions the vocations chosen by these people is that due to the earth having been cursed, they needed to find ways other than farming to make a living.

לטש כל חרש נחשת וברזל THE FORGER OF EVERY CUTTING INSTRUMENT OF BRASS AND IRON — He sharpened tools used in brass and iron work; לוטש has the some meaning as (Job 16:9) ילטוש “He sharpeneth his eye upon me.” The word חרש is not of the form פעל (a noun like אֹכֶל, אֹהֶל etc.), but of the form פועל (a participle), for it has the vowel קמץ קטן (what we term צירה) and its accent is on the last syllabic (whereas the noun form has the accent on the first syllable, and the second has a Segol, like קדש), and the meaning is that he sharpened and polished all cutting implements (כל חרש) used in work of brass and iron.